Lly duramax cp3 leaking Save Share The fact that’s it’s a LBz/LMM cp3 with the LLY regulator on it you should be ok. DD - 2007 Silverado Classic 2500HD Southern Comfort CCSB LT3 06-07 LBZ & LLY Duramax Powertrain LBZ Coolant Leak. So I’ve had my truck for a year now, 05 ccsb lly with 191000 on it right now. 5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero 6. Buy Bosch CP3 Injection Pump for Duramax. 5-05 LLY Duramax Powertrain Cost to replace FPR on test all the intake side for leaking silicone boots or anything, The 1/2" braided rubber fuel supply hoses between the tank and CP3 age and are prone to collapse under high fuel demand, such as pulling up a hill. thats why im thinking cp3 leaking if that is even possible. 2001 GMc Duramax ccsb rebuilt engine with 4x, xxx miles. The cheap fix is Chevy / GMC Duramax 04. LB7 LLY LBZ LMM - CP3 Repair Kit - PROFESSIONAL GRADE. 91 60' Mods: Silencer Delete!, Magnaflow 5" Straight Pipe, S&B Intake, PPE EGR Block off Plate, PPE Shim Kit, PPE Ported CP3 Fitting, Ported Fuel Rail Fitting, Leveled 06-07 LBZ & LLY Duramax Powertrain I found a small leak in the passenger side up pipe where the egr used to go in also ironically I had started noticing the Arp studs/grade C gaskets, PPE stage 5 trans, egr delete, PCV reroute, Fleece 10mm cp3/Fass 150, 60% Injectors, efi live by Kory Willis, HSP Cold Air intake I have an '05 Duramax LLY. As above, I would stay low pressure. I was able to get a look down in the valley while it was running and it looks pretty wet so I'm thinking the cp3/freeze plug, r/Duramax. 07. The LLY's fuel injectors are also known to suffer from injector leakage due to issues with the nozzle or injector body. The [] Ok guys, I finished putting my LLY back together two weeks ago, and she's giving me trouble already. Fuel System. 5-05 LLY Performance Parts front custom fab'd by myself, sdp egr delete, bills custom 4in intake, lmm exhaust, up pipes, airdog I do not know shy all of the sudden I have a major oil leak after getting my turbo replaced but I checked under my truck and had two puddles after it set for an hour. com Free App . The "pins" used on the Duramax crank gear, 2005 LLY 6. After I'm done with finals, my plan is to change the oil, pull the oil fill tube and start the truck while looking at the front gear to see if there is an obvious leak from the cp3 seal. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright The CP3 is the engine driven injector pump -- it pressurizes the fuel to the injectors. Industrial injection torque lock injector cups, Stage 5 sun coast trans. well it wont run at all just died and thats it. 06-07 LBZ & LLY Duramax Powertrain Is there anything that is common to leak of the front of these engines? S&B Intake, PPE EGR Block off Plate, PPE Shim Kit, PPE Ported CP3 Fitting, Ported Fuel Rail Fitting, Leveled. i hope its not cp3 considering i just put 04. Installed new filters on my lift pump. Couldn't see where it was coming from but it was leaking between the oil pan and trans filter on bottom. 8 KB Views: s&s 10mm cp3, built trans with 1058, Danville tuned. Anyone have any insight on this? I'm thinking swap out all 8 06-07 LBZ & LLY Duramax Powertrain Downpipe Heard a lot of air leaking yesterday and checked it out this morning thinking it was a leaking boot. I have a fuel leak running off the back of the engine. Come join the discussion about duramax engines, performance, builds, A forum community dedicated to Chevrolet and GMC diesel truck owners and enthusiasts. It was almost identical to the LB7, with emissions control parts still absent. 6 LLY Duramax with the CP3 Pumps & Upgrades available at XDP. Mine started leaking over the weekend, and with it under pressure at operating temp, it will squirt coolant everywhere as it is leaking. Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and more! Show Less . Leak some air, the CP3 draw overcomes the flaw, you just spin a CP3 Pumps; LLY Duramax CP3 Pumps - Upgrades & Parts. Only way I was able to find it was to run it with the FPR unplugged, which defaults the CP3 to max pressure. I'd follow that trail up and use a bore scope to confirm the leak. LLY engines are known to have a weak spring. The truck will not start. Sep 29, 2023. Only the line coming out of the back of the fuel rail should have no fuel, rest of the return line certainly could have fuel in it (need to block off hose going to FPRV). 02mph SOLD!04. Just as in a blockage or collapsed 04. the only way itll start is if you give it a shot of either an then it fires right up and runs great. Log In/ Register. WILL A FAULTY CP3 COV PREVENT FIRM PRIMING AND REMOVAL OF AIR IN SUCTION SIDE OF FUEL SYSTEM? I found a significant leak at FICM banjo fitting. PART# 12345. Anyone have any insight on this? I'm thinking swap out all 8 06-07 LBZ & LLY Duramax Powertrain. 6K views Race plug has been in for years and never removed how could it not be seated all of a sudden without an external leak. try it with the old FPRV When changing cp3, the same parts were wet but no puddles of fuel on ground. 5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero Maintain or upgrade the fuel system in your 2004. The LB7 had widespread injector issues, so GM redesigned the injectors for the LLY to make them externally serviceable. I only ask bc the pump will put out 24k. 2005 Silverado EC/SB, LLY, 4WD, Edge CTS w/ EGT probe, LML Exhaust Manifold, PPE shimmed FPRV, Banks LBZ air cleaner, Profab intake, LBZ Turbo Mouthpiece, Kennedy twin lift pumps w/ megafilter, Corsa 304 SS Exhaust, Mike L tranny cooler, EXAXT Steering System, Redhead Power Steering Box w/ Amsoil PS fluid, Green Torsion Keys, 2005 2500HD CCSB LLY Duramax Head Gaskets w/ ARP Studs, LBZ CP3, LBZ MP, AFE Intake, Air Dog 4G 165, S&S Injectors, 3. uploadfromtaptalk1349101230215. Duramax First Generation: 2001-2004 (LB7) cp3 leaking fue from so I started the truck and saw fuel running from under the cp3 (like its leaking from the bottom front) and going down the valley. Mcgaughys 2" Drop Shackles, SDP Intercooler Pipes, SDP Y-bridge, SDP Intake, Exergy 10mm cp3, SDP cp3 conversion. Rebuilt with Bosch parts and comes with new Bosch OE fuel pressure regulator. I ended up putting dye in it and finally tracked it down. 5 LLY no start w/ low Full Delete, UDT Tuning, Banks Intake, Jamo Full 5" exhaust, Fleece 10mm CP3 2004 Silver GMC LLY CCSB SLT "Flatbed" S366 with basic Install kit, DSP5 from UDP, Stage 4 PPE trans w/ 3 disc is leaking line pressure. 25. Blown head gaskets, water pump failure, fan clutch failure, and even a dirty or clogged radiator can A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Off the larger line this is where your FPRV is there shouldn't be any fuel at all. Tried to reproduce the leak 3 hrs later and couldnt. 6L Duramax Diesel Engine RPO codes LGH or LML When my LB7 developed a fuel leak on the passenger side, it was the rubber hoses at the CP3. Using compressed air, thoroughly blow dry the regulator and pump. 5-05 LLY Duramax Powertrain lbz cp3 on the lly? Jump to Latest 21K Has anyone heard or done this. Or you can try to pressurize the tank with about 10psi and try starting the truck. GM 04. 2001 lb7 leaking oil from pccv. Lly CP3, fleece cheetah turbo,mbrp down pipe, ppe boost valve, 06-07 LBZ & LLY Duramax Powertrain. $712. SOLD - 2004 LLY 2500HD Crew Cab Long The test is called "Bottle Test"-- here is some info--On the drivers side fuel rail-- to the back and next to the Turbo, you will see a "U" shaped 3/8 hose-- remove the hose from the 5" Flo-Pro, All-in-Truck Performance Tunes, Fass 150. 5 Duramax LLY Crew Cab 4x4 4" Turbo Back MBRP SS Head/Main Studs, 12mm stroker exergy cp3, 100% over exergy injectors, AIRDOG 06-07 LBZ & LLY Duramax Powertrain Leaking line. Lly CP3, fleece cheetah turbo,mbrp down pipe, ppe boost valve, EFI live w/ dsp5, airdog 2 lift pump, s&b intake , cognito I have a 2004 Duramax LLY with about 175000 miles. , Diamond Eye Quiet Exhaust with Quiet Tone Front Pipe, Blocked EGR, Sold 2004 LLY RCLB 4x4 80,000 miles bone stock SOLD 2011 Chevy RCLB 4x4 LML 3500HD SOLD2013 GMC CCSB 4x4 LML 3500HD dads truck 2006 GMC 2500HD, Stock Motor, EFILive by me, Billet 63 VVT, Motorsport Stroker CP3, 20% Nzls, ProFab Manis n Uppipes, BD IC, Hot Pipe IC, ProFab Y-Bridge I have the same problem my 04 duramax, has a coolant leak but I can't find it 2005 Chevy 2500HD Duramax LLY BANKS ram air intake, MBRP 4" exhaust, CAT DELETE and 2006 Duramax LBZ, EFI Live 5 Tunes by Idaho Rob, EGR Delete, Intake Tube, Air Dog Fuel System, 265 Tires, New CP3, CP3 Gear, Injectors, Fuel Rails, Injector Lines at 100,500 miles CP3 exploded and locked up. like i said before though i have torn almost everything off the top and went over all lines and nothing is leaking. No Handling Fees &dash; Free Shipping on Merchant Automotive 10696 Billet CP3 Fuel Injection Pump Rear Bracket. Duramax. and it was the rubber hose going from the cp3 to the rail that little 3 incher were it bends,just rotted out. GM only produced the Duramax LLY engine for a short time. LLY . I'd double check those We strive to keep this the #1 forum for tech and information while continuing the push for new and exciting tech on the Duramax platform. The rough/lope idle is caused by excessively high rail pressure at idle, if the CP3 is worn out there is NO way it would cause HIGH rail pressure, it will only come up short of commanded. This is a one-stop symptom checker for issues related to common rail injectors and CP3 pumps. 5-05 LLY Duramax Powertrain I have an 05 duramax 2500 and have coolant leaking from back of the engine. The CP3 was leaking so I replaced it. I just bought a 2001 lb7 last week and a massive fuel leak started the other day. Yep, getting pretty serious about looking for a nice, well taken care of, used LLY duramax. You should be able to tell which one is leaking. Just checked injector lines and they were tight. Sometimes the truck desires 23k and the truck will give it 17 before it limps. I hear a lot about the PCV lines leaking, thats 04. The lbz/LMM regulator use different voltage. Turned out to be leaking from the front of the driver's side fuel rail, where the plug threads in. 5-05 LLY Duramax EGR Valve : GM 97303761 or ACDelco 2142109. So I assume the higher pressure is causing it to leak more. the fuel would run through the As you know the Duramax does not have a lift pump to push the fuel from the fuel tank to the engine, it uses the injection pump [CP3], to draw/suck the fuel from the fuel tank through all the fuel lines, filter, FICM and then into the CP3. The CP3 wont. My research tells me that a CP3 seal leak can cause that, but my fear is that one injector is washing down a cylinder. No fuel is spraying anywhere, just a decent drip so I am thinking its the return system. Save Share Chevy / GMC Duramax 07. Duramax CP3 Rebuild Seal Kit Includes: All internal o-rings; Drive-shaft lip seals (2 Protective caps (3) While CP3 repair is not usually considered a "DIY" project, sometimes minor issues such as a leak can be corrected in the field. The fuel was running thru the motor valley to the back and draining onto the trans bell housing and onto the ground under the passenger side. 6K views I have the Danville AC Delco pump is not that expensive and you will kick yourself if the original one starts leaking after doing the CP3 conversion. 2004 crew cab lly bone stock for now. 2015 GMC 3500HD CCLB DRW Fleece Cheetah, 50 state CP3 Conversion, EFI Live, Airdog 4g 2008 LMM EFI Live by Nick, Transgo jr. GM had resolved the injector problems by the time the LLY engine was released. Any advice would help greatly I have coolant puddling in the valley, on the cp3, trans pan, and puddling on top of the passenger side fuel rails. 2006 LBZ Under Construction S480/stocker This baby aint leaking! Sent from my MB860 using AutoGuide App . 2004 LLY 4x4 MBRP 5" straight, AEM Brute Force HD, DSP-5 Unplug the FPR wires and try to start it. I have an LLY and it has an Airdog 150 lift pump on it that has approximately 9 psi fuel pressure when key is on. I spray some brake parts cleaner down the bolt hole, then use compressed air to blow the crap back out. cdbright; Dec 9, 2019; Replies 15 Views 2K. Just saying. 1; 2; Next. But it increases wear and tears on 04. Afterwards it then flows through the injector lines and connector tubes to get to the injectors. A forum community dedicated to Chevrolet and GMC diesel truck owners and enthusiasts. 365@100. I have been told, if you put the lbz cp3 on the lly(get rid of the lly cp3) it will have about a 10% increase in fuel flow. Truck had an LBZ cp3 and regulator, and my tuning has been updated for the turbo and rescaled for the regulator. The injector balance rates are good. CP3 Leak. 4K views So it looks as though my CP3 is leaking. I replaced the fuel pressure regulator and the two rubber return lines above the cp3, drained the oil and no diesel fuel came out with the oil. Come join the discussion 2005 LLY CCSB LT2 4X4 Driven by Austin ECM Tuned by Kory @PPEI TCM tuned by Dustin @DA Performance: Bullseye Power S468_83_. A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Submit. Clean the fuel pressure regulator and high pressure injection pump thoroughly with solvent, such as GM P/N 12377981 (Canadian P/N 10953463), or equivalent. I removed all If it's a leak in the fuel supply, the pressure on the fuel tank will reveal it. If you unplug the fuel pressure regulator on the Industrial injection torque lock injector cups, Stage 5 sun coast trans. Failed injectors on the LLY specifically are also known to throw P0087 codes while loaded down or towing. 2005 Silverado EC/SB, LLY, 4WD, Edge CTS w/ EGT probe, LML Exhaust Manifold, PPE shimmed FPRV, Banks LBZ air cleaner, Profab intake, LBZ Turbo Mouthpiece, Kennedy twin lift pumps w/ megafilter, Corsa 304 SS Exhaust, Mike L tranny cooler, EXAXT Steering System, Redhead Power Steering Box w/ Amsoil PS fluid, Green Torsion Keys, Got a stock fuel pump off a 7. 1 of 2 Go to It has a spring inside, and if the rail pressure overcomes the spring pressure, it dumps fuel back to the tank. 5" straight piped, 3" Down pipe, no CAT, EGR Delete, Transmission build - billet shafts and triple disc, Houser EFI Liver DSP5 & More As with the earlier LB7, the LLY Duramax can be a good choice for someone looking to get into a heavy-duty diesel truck at a slightly more affordable price tag. Unscrewed the cap to the coolant tank and it went back to normal (I have read that can be fixed by replacing the cap). When I went to try to start it, 1) it wouldn't start and 2) there was fuel leaking and best i could do was narrow it down to the valve cover on the rear driver side of the block. 05 cc/sb lly 6in stack with 4in straight pipe, 6in lift with 37s, king coilovers in front custom fab'd by myself, sdp egr delete, bills custom 4in intake, lmm exhaust, up pipes, airdog 2 lift pump, lbz cp3 pump/ regulator, fprv shim kit, arp head studs and gaskets, dsp 5 tuning by rob, garret 4094 turbo, built trans by mike l. My question is if I need to replace the fpr or the cp3. jpg. The leak would show itself on the bottom side of CP3 when pressurized with the priming pump on filter housing. Come join the discussion about modifications, towing, To top it all off, I've got fuel in the oil, which I've never seen on an LLY. A crack or hole in a fuel line on the low pressure side sucks in air. Jump to Latest 8. high pressure injection pump . 6 Fuel . 2006 GMC Sierra 2500HD CC/SB D/A 4x4 - PPE Air Box mod, MBRP and wrap it back in to where the black hose (that leaves the filter) and enters the CP3 inlet. 2006 GMC Sierra 2500HD CC/SB D/A 4x4 - PPE Air Box mod, MBRP and wrap it back in to where the black hose (that Chevy / GMC Duramax 01-04. Come join the discussion about modifications, towing, classifieds, Backed my truck down from the house to the garage at my in-laws last night, pulled in the garage and had coolant running out of the front of the truck, looked under there, Its pretty rare that the cp3 will leak fuel through the front seal into the engine . Duramax LLY: 2004. 4x4 extra cab . Chevy / GMC Duramax 07. Has a a juice with attitude tuner but no other performance upgrades. nothing in the bottle) and noticed quite a bit of extra fuel returning in the line that I had sealed off with a bolt (ie it was enough pressure to start leaking past the bolt when I I have an '05 Duramax LLY. This rarely failing on the LLY Duramax - always do the Ice Pick procedure before replacing the FICM. LLY: Coolant leak, best approach? Thread starter frankenstien; Start date Sep 11, 2016; a van t stat housing, clear that pipe off the top of the motor, as it will have to come out again when i have to do my cp3 this winter. Sent from AutoGuide. The leak or mist may come out of the front seal of the CP3 which would return to Chevy / GMC Duramax 04. 5-2005 GM 6. 06-07 LBZ & LLY Duramax Powertrain Manifold up pipe leak. Name: Matt ASE Certified, SOLD - 2004 LLY 2500HD Crew Cab Long Bed A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. For CP3, if you can find a decent deal on a LBZ or LMM FPR (should be able to find something for under $200), it might be worth swapping out so you can get 26k rail pressure instead of 23k, assuming you're dealing with a LLY. Come join the discussion about modifications, towing, classifieds, Recently I have noticed a pretty healthy fuel leak on the ground while idling. i didnt know if it was a problem with lines goin to the cp3 so what i did was hooked a line directly to the cp3 CP3 leaking into crankcase? Jump to Latest 2001 GMC Sierra crew cab SLT 6. Fuel leak around transmission bell housing. Jump to Latest I might be getting drips on the floor I removed the inner fender wells on the front last night so I can see what’s leaking and where . All new fuel lines and so on for cp3 change. Recently shut off while driving down the interstate, tracked down a fuel leak to the CP3. From all out performance builds A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Duramax Hard Parts. Fleece turbo drain tube and any advise on oil leak. no air in system. Put a hose on it and run it into a container. 20 @ 72mph 1. To top it all off, I've got fuel in the oil, which I've never seen on an LLY. 6L LLY Duramax. Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and more! Show Less I have a fuel leak in the valley running down the back of the motor around the bell housing. Jump to Ripped apart my truck to put an industrial injection CP3 and drill out my passenger side fuel rail fitting and everything went back together over the next couple of days and found the more you are into the throttle and the more boost the more coolant it is leaking. 8K Mine ended being the cp3 leaking. is there any other things I should look at before I start replacing CP3? 04. If you unplug the fuel pressure regulator on the cp3,it will max out rail pressure and 04. indicating a faulty CP3 cascade overflow valve. Duramax CP3 Rebuild Seal Kit Includes: All internal o-rings; Drive-shaft lip seals (2 Protective caps (3) While CP3 repair is not usually considered a "DIY" Well usually the FPR will lope the idle of the truck or make it idle rough. Leak some air, the CP3 draw overcomes the flaw, you just spin a few more revs to start. I test fuel pressure at 6 psi to cp3. 5-05 LLY Duramax Powertrain Low boost lly. The smaller line is from the injectors/cp3 pump and the larger line is from the common fuel HP header. this is about what you need to do to replace the cp3 pump in a late model 2004 duramax because of a no start just cranks low fuel pressure numbers in the 200s. 76 @ 115 04. stock LBZ Enhanced Injector Return Flow Test- GM has come up with a test for use on the later Duramax engines. Under 23000psi, any leak should make itself obvious in a hurry. Also have: 2 - 1992 W250 Cummins 1- Auto 1 - 5 Speed 1 - 91. I can crank the truck for 30 seconds and it won't build any rail pressure, if I pinch lift pump return line and get 15 psi+ it fires right up, then I can un-pinch it and truck runs and drives great. After replacing banjo seal, 2006 Duramax LBZ, EFI Live 5 Tunes by Idaho Rob, EGR Delete, Intake Tube, Air Dog Fuel System, 265 Tires, New CP3, CP3 Gear, Injectors, Fuel Rails, Injector Lines at 100,500 miles CP3 exploded and locked up. i was towing about 5k lbs last month and it started leaking pretty bad. If it sits idiling for a while it will make a puddle on the ground. Jump to Latest 5. 5-05 LLY Duramax Powertrain Fuel filter head leaking. My fuel pressure will go up to 24k, but not as fast as the truck desires it. It will make the CP3 work at 100%, and create 100% rail pressure. Skip to Head gasket leak test; If any of the above tests are Since the fuel lift pump is not available in the LLY engine, the CP3 injection pump does lift fuel pump work. For more major concerns additional hard I seem to have sprung a leak from the plastic hard formed hose that Full Delete, UDT Tuning, Banks Intake, Jamo Full 5" exhaust, Fleece 10mm CP3 2004 Silver GMC LLY CCSB SLT "Flatbed" S366 with basic Install kit Surprise Duramax 2005 GMC LLY,6 INCH LIFT,FOX SHOCKS WITH REMOTE RESEVOIRS,MOOG PITMAN ARM & IDLER ARM 06-07 LBZ & LLY Duramax Powertrain Manifold up pipe leak. my buddies LLY with CP3 issue. A leaking FPRV will not allow you to build pressure. Tags fuel leaks lbz. A filter rebuild can often cure this issue. 5-2006 model years. 06-07 LBZ & LLY Duramax Powertrain. Repeat until clean. Nope. Pressure Regulator d. Because it sounds like the CP3 isnt priming itself for some reason. Is it un-necessary 04. com was founded in 2006 and created a site which houses some of the best known Duramax tech you can find. I made a quick YouTube video so y'all can see Cp3 or fpr Duramax lly - YouTube I just got done chasing down a fuel leak (hopefully). Lly CP3, fleece cheetah turbo,mbrp down PPEI Tuning, CP3, Fass 150, 5" exhaust, DP, 05' Chevy LT Black on Black LLY CC/SB Blackout Performance built motor/trans/tuned- Gone "The Blessed Hellride"-Summit white 08' GMC Sierra SLT Z71 CC/SB-Big Dipper trans, quipped with 6. The topic deserves a more detailed discussion, so let's get started. I seem to have sprung a leak from the plastic hard formed hose that Full Delete, UDT Tuning, Banks Intake, Jamo Full 5" exhaust, Fleece 10mm CP3 2004 Silver GMC LLY CCSB SLT "Flatbed" S366 with basic Install kit Surprise Duramax 2005 GMC LLY,6 INCH LIFT,FOX SHOCKS WITH REMOTE RESEVOIRS,MOOG PITMAN ARM & IDLER ARM My fuel pressure will go up to 24k, but not as fast as the truck desires it. So any small leak in the filter or fuel lines it will suck air and affect the running of the engine. How to rebuild the filter head - Here 04. How many of you guys have an internal leak on 2004. I am having trouble finding where this fuel leak is coming from. N. Chevy / GMC Duramax 04. Well when I bought it, it surged like a motherf*cker. I installed new head gaskets, Bosch auth reman injectors from injectors direct, a 4094avnt turbo. Jump I have a major leak on my up-pipe coming in to the turbo how much is it hendering Arp studs/grade C gaskets, PPE stage 5 trans, egr delete, PCV reroute, Fleece 10mm cp3/Fass 150, 60% Injectors, efi live by Kory Willis, HSP Cold Air intake, 2 inch up pipes/lml Fuel line leak: due to the low pressure side being under vacuum, a leak typically does not present itself visually with leaking fuel. Help Desk. 2, 8 speed trans, s&b intake, elite engineering e2x ultra catch can SOLD 16 CCSB Z71 LTZ 2500 - SDP cp3 conversion, exergy sportsman, SDP y bridge intake and intercooler pipes, FASS titanium 165, 5” jamo straight pipe, UDP tuned 04. Duramaxdiesels. This kit can be purchased with a new, modified, Dueling Dragons (two 85% Dragon Fire CP3s) or the Dueling Double Dragons (two 120% CP3s) CP3's for those who compete in the competition circuits. Arp rod bolts, main studs, and head studs. Any input would be appreciated. Crank the engine over until fuel begins to flow from the hose from the CP3 return. 2004. It ran great like this for one day but as mentioned above I sprung a leak at the upper rad hose thermostat A week ago I was running an errand and when I got done my truck wouldn’t start. I have a good deal on one and was wanting to know if it is worth it or not. CP3 leaking into crankcase? Jump to Latest 2001 GMC Sierra crew cab SLT 6. 5-05 LLY Duramax Powertrain Known places that leak Built Motor (rods pistons cam ect. Fits: 2004. 5-05 LLY Duramax Powertrain P0089 With new CP3 and Sounds like your fuel pressure regulator is leaking. 5 LB7 Duramax Powertrain but now I'm trying to chase down a fuel leak. Lly oil leak Thread starter 2005redlly; Start date Mar 21, 2017; Forums. SOLD 18 CCSB Z71 LTZ 1500 - 6. 05 LLY new cp3, race plug and new injectors still have p1093. Since it's extremely difficult to test and find where air might be leaking in, people usually pressurize (gently, like blowing from a shop vac) the fuel tank and then look for leaks. Of course the pump would have to be off. Save Share Reply Quote Like. Duramaxdiesels. There should be fuel coming from the smaller line, but very little. i also hear a hissing sounds coming from the passanger side of the engine bay when I turn the truck off. All balance rates are good on the injectors. 24. Return lines carry fuel from the injectors, CP3 and the FPRV (in the case of overpressure). 6 Duramax LLY Popular Aftermarket Upgrades. 06-07 LBZ & LLY Duramax Powertrain Fuel Filter That's what I'll do if mine ever starts leaking. The duramax does not have a fuel pump in the tank or lines- it uses the CP3 pump to pull the fuel from the tank. To work properly your lift pump needs to be mounted below the fuel level in the tank. 5-05 LLY Duramax Powertrain 2005 lly low fuel they said it sounded like the cp3 was going bad. I was hoping to get in touch with a Duramax mechanic that was looking to do some side work, or maybe someone who has an idea of where this leak could be coming from. when i pump the primer its comes out at a good rate. LLY Upgraded turbo and cp3? Jump to Latest 6. what I've tried- new cp3, new filter housing, new filter, I pinched the Does anyone know what the GM specs are for fuel return rate on the CP3 pump for an LLY? I was just working on my FPRV today (bottle testing at 160 Mpa, it was holding fine. If you have it mounted high against the bed then it could loose prime and not work until the CP3 had drawn some fuel into it. fuel pressure relief valve (high pressure limit valve), check to make sure it is not leaking into the return system when rail pressure is 160 MPa i bought a 2001 duramax. Tags duramax 2500hd lbz. The truck is a 2005 LLY. 06-07 LBZ & LLY Performance Parts Discussion how to test 2002 GMC 2500 Duramax 6 INCH STACKS, 35" nitto grapplers, 17 Dick Cepek wheels, four What should the pressure be on an 06 and if its low does that mean cp3 or fpr or either . If that proves uneventful, I'll do the same with the valve covers off and look for injector leaks. The LLY Duramax responds well to aftermarket modifications, especially with the factory Garrett GV3788VA turbocharger. LLY Coolant Leak (Front Driver's Side) Npushor; Sep 24, 2024; Replies 0 Views 140. 2002 GMC 2500 Duramax 6 INCH STACKS, 35" nitto . I made a quick YouTube video so y'all can see Cp3 or fpr Duramax lly - YouTube 04. Exergy 45% & Exergy Sportsman CP3 Danville BMW GT3794Va Stg2 w/ DSP5 STOCK fuel filter housing for a 2004. Loosing fuel prime is often associated with an air leak at the fuel filter housing. 01-04. Take the return line off the CP3. 5 I have a 2003 Chevy 2500 LB7 with 200k miles, injectors were done around 110k. A good way to check is get a scanner that reads actual fuel rail pressure. I replaced the cp3 last weekend and still have the same issue. When I look at the top of the engine, I can see fuel pooling in the valley. if not i have not clue i cant find anything after 3 hours of looking. List View. LLY Duramax When my LB7 developed a fuel leak on the passenger side, it was the rubber hoses at the CP3. 260000 miles from a guy. 31@108. 6 Technical. After 17 years and about 230k it’s looking like time for new fuel lines on my LLY (crew cab short box). 5-10 LMM Forums. Also replace the clamp on that line while you are at it. 23. GM had resolved the injector problems by Chevy / GMC Duramax 04. When driving, fuel is sprayed all over the undercarriage. 5-05 LLY Duramax Powertrain Weird Loss of Fuel I installed my Industrial Injection CP3 Bag of Parts upgrade approx 2 months ago. Start with the small things first. r/Duramax. 08 CCSB LMM - HSP s369sxe, s&s 10mm cp3, built trans with 1058, Danville tuned. $69. 5-05 LLY Performance Parts Discussion. 57 On stock turbo and fuel system Thanks to EPR Twins, Big Dipper 40% overs, MBRP Cool Duals, LBZ CP3, ADII, BD Manifold, C2 Gauges, H2 Wheels, Cognito Sleeves and Duramax Fuel Injectors b. 5, 2005 Diesel Pickup, Topkick & Kodiak with LLY Engine. 90/ Profab WG Pedestal/AFE 3" Intercooler Tubes hot&cold/ 3" Custom Y Bridge/ 4" Custom Downpipe/ Custom 5" LBZ S&B Intake/ Exergy Sportsman CP3/ Suncoast Gmax-5/ Precision Converter/ RDP 04. Jump to Latest A lift pump reportedly takes some strain off the CP3, but I haven't heard that it does anything for the injectors. Arp rod bolts, Duramax Fuel Injectors b. Come join the discussion about duramax engines, performance, builds, Below are the pics of my buddies CP3, the one with 2 arrows shows the bolts that were backing themselves out and the other pic is where the leak is coming from, any of you Despite these issues, a majority of LLY Duramax overheating is actually caused by other common LLY Duramax problems. 3K views I took the top end apart enough to see it appears the line coming from the cp3 to the 06-07 LBZ & LLY Duramax Powertrain Leaking line. 6 DURAMAX 19 YEARS OLD AND BOUGHT THE TRUCK MYSELF 6 INCH FABTECH LIFT,FULL TIE RODS 20 INCH CHROME ROCKSTAR XDS ON 35 IN GRAPPLERS Injector leaking badly 2) Damaged CP3 pump The rest of the injection system is completely external to the crankcase. High-Pressure Common Rail Basic Information and Function High pressure is built and then delivered by the pump to the fuel rail manifold. 6L Duramax K and N air intake Chevy 04. This was a used CP3 I found for a good price but figured I'd be proactive and swap my CP3 with a higher output one with lower mileage or so I thought. My filter head was leaking air so I put a fass pump on it, still nothing just cranks. its either the cp3 pump seals or the o-rings on the injector, as mentioned above throw some dye in the fuel system, remove the valve cover and if no dye shows up near the injectors (or no injectors are loose) then the pump seal must be leaking Chevy / GMC Duramax 06-07 LBZ & LLY Forums. Jump to Latest a buddy of mine has a 06 lly and it seams to be leaking fuel out of the commin rail at the back of the head 04. LBZ - Where is this Diesel Leaking From? Jump to Latest 4. Jump I have a major leak on my up-pipe coming in to the turbo how much is it hendering Arp studs/grade C gaskets, PPE stage 5 trans, egr delete, PCV reroute, Fleece 10mm cp3/Fass 150, 60% Injectors, efi live by Kory Willis, HSP Cold Air intake, 2 inch up pipes/lml First post! I have a 2006 LBZ with a fuel leak, I am not duramax savvy, and I have exhausted all of the knowledge that I have to fix this leak. Bosch 0986437308 Reman CP3 Fuel Pump. stock cp3 2005 LLY EC/SB Built motor Triple turbo Limitless Diesel Comp Trans 04. The fuel was running thru the motor valley to the back and draining onto the I have read many threads about oil leaks on the LLY's, I have a leak that I would think would be a rear main seal, but i dont know. Jump to Latest A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. 5-05 LLY Duramax Powertrain 2006 gmc coolant leaking my brothers gmc duramax is leaking coolant its tuned with a tune from duramax tuner and just started leaking and we cant tell where its from , any ideas? Jeff Exergy 10mm Cp3 04. Jump to Latest 24K views You either have a slight air leak that is hard to find, CP3 is not holding the pressure, or an injector is leaking. Rebuilt Bosch high pressure common rail CP3 injection pump for LLY 6. Sep 24, 2024. Account. It definitely appears to be oil. 13. I then think air in the system. 04. There’s nothing wrong with the factory EGR System if you like keeping OEM parts! The LLY Duramax doesn’t suffer the same widespread EGR problems like the 6. . I guess it leaks a ton though when it does. Looks like no one responded? I’m have same symptoms; however, I’m not certain the LLY (2004. Jump to But mainly trying to rule out that I have boost leak and you did that thanks!! bars- DHD stainless DP-4" MBRP- PPE 06-07 LBZ & LLY Duramax Powertrain Losing Prime after I have no codes and it runs great when started. It will lope hard if it starts, But it's an idea. 0L Powerstroke. Jump to Latest 2. C. 5-10 LMM Duramax Powertrain vacuum port for fuel I know of an LLY that had one leaking. 5-2005 GM Silverado/Sierra 2500HD/3500HD 6. Gideon 01 LB7 2007 Yukon Denali It's only giving out 250 on actual fuel rail pressure did i miss something maybe a leak? 05 2001 lb7 leaking oil from pccv. 04 LLY Losing fuel prime. Jump to I have replaced my fuel cooler and replaced the leaking steel lines to it with rubber lines. 6K views I have the Danville 3794 stage 2 on my LLy and love it! Stock cp3 and injectors as well. anyways i know the problem is because when crankin it over the rail pressure is only at 600-700 psi an i need 1500. 5-05 LLY Duramax Powertrain Weak CP3 vs bad injectors I have a leak on my fuel filter head, but I dont know if this could cause this issue or not. 5-2005) has a cascade overflow valve on the CP3 pump. Duramax 6. 5 Duramax LLY Crew Cab 4x4 4" Turbo Back MBRP SS Head/Main Studs, 12mm stroker exergy cp3, 100% over exergy injectors, AIRDOG 04. 5-05 LLY Duramax Powertrain. The upper radiator hose doesn't Built Motor/Trans • Bullseye s475/87/. 5-05 LLY Duramax Powertrain lly fpr install. . Duramax tuner Efi live Edge cts3 Mishimoto trans cooler and intercooler with upgraded 5/8 lines DP 65mm stg2 turbo Exergy 60 I just bought a 2001 lb7 last week and a massive fuel leak started the other day. That's what I did and sure enough 2005 Duramax LLY LS trim 4x4 Mods: Secondary Cooling System with fan and shroud, Larger custom main radiator equipped with heat exchangers for oil and tranny fluids, larger transmission cooler, custom larger lower panel, KD custom ECM, EGR blocker, Sun Coast ram air hood, Air Raid intake, AFE turbo MP and downpipe back exhaust, 75Gallon aux tank, I replace FPR on CP3, problem not mitigated. The only tip I learned doing it and can share, get yourself a set of short well metric 1/4”hex shank (like you use on a drill, not 1/4” ratchet drive) bits and a 2004 - 2005 Duramax LLY Dual Cp3 Kit (W/O Pump) The Industrial Injection dual CP3 is the ultimate for performance. The fuel appears to be coming from the Does anyone know of any other parts or check valves on the fuel system that would restrict flow while causing the CP3 to leak ? I’m at my wits end with replacing 3 pumps Hello gentlemen, I'm looking for any advice please. Within 3 days, A weak FPRV leaking by, search 'bottle Test' to check and see how much if any fuel is leaking by. I am pretty sure the leak is a return line somewhere on the top of the engine. Some do not seal very good. Buy 6. 5-05 LLY Forum. Stand for Fuel Injector Control Module. so far 3 of 8 ok. The CP3 has to put a minimum amount of fuel pressure on the injectors before they'll open (IIRC, It doesn’t happen often from my knowledge, but it could be the cp3 leaking from the shaft seal behind the drive gear. 6. It's the supply line the reason it doesn't leak is because it's under a vacuum as the CP3 pump pulls fuel from the tank through the fuel filter and to the injectors. Want a crew cab short bed, lower miles <130k, leather or non-leather, middle bench seat preferred, etc. We strive to keep this the #1 forum for tech and A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. Reposition the hose. A week ago I was running an errand and when I got done my truck wouldn’t start. I start to tests injectors by capping off at fuel rail. 3K views I took the top end apart enough to see it appears the line coming from the cp3 to the fuel rail is leaking at the fitting what kind of fitting is 06-07 LBZ & LLY Duramax Powertrain Fuel Filter That's what I'll do if mine ever starts leaking. Reason - they don't have LB7 injector problems (yes, I understand they can still have injector failures), and they are usually cheaper than LBZ. If your lift pump is working it should cover any air leak issue by making it a fuel leak. fuel leak down the back of the block?? Jump to Latest 12K views The last guy that looked at it commanded max pressure on the cp3 and still couldn't get it to leak. I can't remember the amount. I replace temporarily the hose (with clear hose) from the filter head to the connection to cp3 near back of alternator where test port is. We strive to keep this the #1 forum for tech and information while continuing the push for new and exciting tech on the Duramax platform. Took me awhile to track it down. 0 04. It may help the CP3 prime itself. It's the supply line the Chevy / GMC Duramax 01-04. 5-05 LLY Duramax Powertrain CP3 return line coming off? Jump to Latest return line on my CP3 has come off twice in the last 300 km. , it seems I have a very rare situation with my DuraMax CP3 high pressure diesel injection fuel pump(s). 5 D250 Cummins with HP Fuel Pin and 3600 RPM Gov Spring . This test is specifically for the LBZ engine, but could be applied to Exergy Reman Performance +30% injectors are the perfect upgrade for those who have added (or plan to add) a built transmission, modified high-pressure pump, and drop-in turbo upgrade. I hear a lot about the PCV lines leaking, thats where all you pros come in! 2005 Chevy 2500HD Duramax LLY. Disable the injectors. I had same leak. 19. The whole underside of the truck is soaked in diesel. 9 • 45% Injectors • Stock CP3 • Built and Tuned by Blackout Performance • 11. LLY Duramax OEM Emissions Components My first guess is a leaky cp3, unfortunately. 6 Duramax. Verified pressure at the fuel rail before the cp3 and it is 12psi. Grid View. Today i noticed my top radiator hose was collapsed when the truck cooled down. Jump to Latest 4K Come to find out it was a crack in the CP3 I have a leak after head gasket replacement that I can't track down. I’ve only seen in this or other forums that it’s on the Cummins 5. 9 and other engines with a CP3just doesn’t mention the LLYDuramax. 1/4: 13. Come join the discussion about modifications, towing, classifieds, I can visibly see the fuel is wet at this connection between the CP3 and the Fuel line from the fitting on the CP3 to the fuel rail. , Diamond Eye Quiet Exhaust with Quiet Tone Front Pipe, Blocked EGR, Sold 2004 LLY RCLB 4x4 80,000 miles bone stock SOLD 2011 Chevy RCLB 4x4 LML 3500HD SOLD2013 GMC CCSB 4x4 LML 3500HD dads truck 01 duramax leaking fuel running rough hard start. Installed a new fuel filter head with new filter. A big plus is that you're less likely to have it lose prime and not start, and to be able to find a leak in the old fuel lines if a leak develops (fuel out instead air into the line). There are 9 most common problems associated with Duramax LLY. Members Online. The cp3 leaks down into the valley of the motor and it drips down the back of the motor and onto the bell housing. 72. Maybe someone who has fun into the Did the bottle test on the fprv it was good with no leak by. Again my suggestion to find the leak fast is a lift pump but with some diligence you should be able to find the source of the leak. Curious if there is a cause of this or did the spring clamp just get weak over time and letting it come off? Couldn't see where it was coming from but it was leaking between the oil pan and trans filter on bottom. Fuel Leak Top of engine. 5 LB7 Forums. Npushor. Like sucking a coke with a bad straw-- you only get air. Put dye in the fuel, and run with valve covers off again looking If your looking down the oil fill tube hole, your looking at timing gears that run the CP3 gear. If it is completely cold it will try to fire and sometimes starts but if it has been running it wont start up again. 6 But checked it again the next day and there was a very small amount. 06 LBZ Duramax cp3 pump + fuel injector replacement help/info. 5-05 LLY Duramax Powertrain Lbz cp3 and have a no new cp3 no start - Duramax Diesels Forum . Attachments. Mcgaughys 2" Drop Shackles, SDP Intercooler Pipes, SDP Y-bridge, SDP Intake, Exergy 10mm cp3, SDP cp3 Duramax LLY Overheating, LLY vs LBZ Air Intake ,PPE Trans Cooler,ADII 165, ATP EFI live, race valve, pcv reroute, Garage 808 traction bars Stock turbo/injectors/cp3 2" LLY: CP3 pump rebuild Thread starter Krazykid; Start date Mar 21, 2010; Forums. 5 LLY???? My primer plunger was leaking and did a rebuild,, leak is better but still wet. This solved issues with leaking injectors and Other issues aside (fuel line leaks, etc), there are many claiming that a new FPR fixed fuel pressure issues, and at least as many or more claiming that a new CP3 fixed their You should be able to bench test the CP3 for leaks by using a can of fuel and a hose. 5-05 LLY Duramax Powertrain oil leak next to harmonic and doesnt appear to be leaking. 4L Powerstrokes 05 cc/sb lly 6in stack with 4in straight pipe, 6in lift with 37s, king coilovers in front custom fab'd by myself, sdp egr delete, bills custom 4in intake, lmm exhaust, up pipes, airdog 2 lift pump, lbz cp3 pump/ regulator, fprv shim kit, arp head studs and gaskets, dsp 5 tuning by rob, garret 4094 turbo, built trans by mike l. Would I be best to just replace the fuel line from the CP3 to the Fuel rail and see if that solves it? If it doesn't leak when the lift pump is bypassed, then it must be the section of line between the lift pump and the gear pump in the CP3 that is leaking. I think leak is upfront and fan is blowing it back. 5-05 LLY Duramax Powertrain Lly Duramax fuel problem. Fuel runs down the back of the block on the drivers side while cranking. ) Danville Billet 72mm VVT, II Dual kit w/ Two Wicked CP3's, Suncoast. c. No loss of power, No visible leaking at idle and No diesel in oil. 2007 Suzuki ltr Billet HTT S366, 45% Injectors, 85% Cp3, Hamilton Valve Springs LML Manifold, 4" Exhaust,7inch Stack, 60" Traction Bars Blackout Performance Trans with 1058 2001 Chevy Duramax. Any advice would help greatly I’m pretty sure my cp3 is out but I wanna share with everyone what’s going on before I go throwing parts at it. 3l I was thinking about trying to run on my LLY with remote filters then feeding into increasing the CP3 supply from 5psi to 10psi isn't going to help you May 15, 2013 #16 Ill say this, i cant say anyone has proved too much PSI is bad for a duramax besides the FICM deal. Chevy HD 2500 Duramax Diesel Fuel Line Leak Help. Jump to But mainly trying to rule out that I have boost leak and you did that thanks!! bars- DHD stainless DP-4" MBRP- PPE BIV- AD II 200 lift pump- edge insight CTS- spectre CAI- 45% over injectors- LMM cp3 & FPR -EFI live dsp5 from tony burkhard and danville performance Duramaxdiesels. Jump to Latest Airdog 2 165, 30% over injectors, Exergy 10mm cp3, PPE Race Fuel Valve& Ported Rail Fitting, Danville Performance 68mm stg2r, S&B Air Intake, AFE Mouthpiece, 04. Jump to and balance rates are within specs,runs great but sometimes ok get a lil lope,and I replaced fuel lines from head to cp3,,, Mabye the EGR delete kit is leaking coolant back into the exhaust. Photo taken from Amazon website. I replaced the connector and and it ended up being the clamp that had gone bad and coolant was leaking by. Products [22] Sort by: Brand. I have read many threads about oil leaks on the LLY's, I have a leak that I would think would be a rear main seal, but i dont know. So I replaced the cp3 pump and did all the egr delete and a new water pump while I My Lly has been clacking under acceleration between 1400-1800rpm aswell as shaking at idle and periodically knocking, injector 7 reads at +15 for balance rates when it’s doing it in park but usually only does it in drive At that 1400-1800 rpm range. 5-05 LLY Duramax Powertrain Has anyone had their rear main leak? EFI by Mark@Danville*DP GT3794va Stage 2*Fleece Powerflow 750 CP3*Bill's Intake w/Porercore Filter*All Season High Flow Intake*DHD Y-bridge*LML DS Manifold*Suncoast GMax 6pac w/1058 converter by Riley Gullet*Merchant TCase and Tcase Brace*FASS Industrial injection torque lock injector cups, Stage 5 sun coast trans. 5 Chevy Silverado Duramax LLY CC/SB-EfiLive w/DSP5 -BD Supermax Turbo W/ SP Twin Turbo Kit-Full Built Transmission-Flex -Custom Drop Hitch-Custom Bumper-Lightforce Lights- Rockford Speakers -Colbalt Digital Gauges-Industrial 42% Over CP3-Mitusa Pump-Fuelab Lift Pump Just consider changing a CP3 pump a right of passage for a true Duramax owner. Looks like up near the cp3 is where it's coming Duramaxdiesels. 22. 2, 8 A forum community dedicated to Chevy and GMC Duramax diesel owners and enthusiasts. 5-05 LLY Duramax Powertrain Lots of fuel I went to take a look at it this morning in the light and can't seem to find where it is leaking and its no small i had a leak that bad. Fuel pressure regulator, check to make sure it is not stuck. OEM part numbers: 97303762, 0 445 020 030, 0986437308. 5-05 LLY Duramax Powertrain LLY Truck Fuel System Not Which leads me to believe that the cp3 is functioning. 2006 LLY Crew Cab 1/8 mile: 9. Deals. Got a ton of air Fass 150. Remove the injection pump inlet hose from the fuel feed distribution (leak-off) block. The leak comes from the back of the engine, and drips from the back of the oil pan onto the ground. So any small leak in the lines-filter or filter head -, will allow air in the fuel system. try it with the old FPRV Return lines carry fuel from the injectors, CP3 and the FPRV (in the case of overpressure). took it to the shop and they EFILive by me, Billet 63 VVT, Motorsport Stroker CP3, 20% Nzls, ProFab Manis n Uppipes, BD IC, Hot Pipe IC 04. 5-05 LLY Duramax Powertrain 04. While not as detrimental as a failure on the LB7. If there is a seal that runs around the turbo shaft has anyone heard of coolant leaking out of it and collecting in the turbo when the 05 LLY CC/SB 4x4 12. I installed a LBZ CP3 with the LLY fpr on the first go putting things back together. 06-07 LBZ & LLY Duramax Powertrain fuel leak. axrbwh owpq lgtyyzv garkj uhbhl imssq njod obax rppvb ebhbzr