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Thread: Lift pump and injection pump NEED HELP

  1. #11
    Lifetime Member LB72004's Avatar
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    most mods done to the CP3 that increase the flow will require the tables in the ECM that control the pressure regulator be adjusted so it will run right. you will end up with higher then normal fuel pressure and the ECM wont know how to bring it back down.

    with EFI Live it is an easy adjustment. you will also be able to trouble shoot many a things with it too. may want to look into getting this before swapping out the CP3. then again your current CP3 may have been a modded pump and the tables may have already been adjusted some. with this truck having a LP and not knowing everything done to it who knows.
    2008 Chevrolet 3500HD DRW LTZ
    285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

    Sold - 2004 LB7 Duramax, EFI Live with DSP5 Tune
    stage 4 SC transmission, 265/70/16 tires

  2. #12
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    UPDATE: so i got my new lift pump threw it on truck starts and runs now, dosent seem to run right though seems to have a slight lope/skip while its at idle in my driveway. Have not installed the new injection pump yet i am still under the impression that the stock injection pump is toast. i do have bigger injector nozzels on it and truck seems to have some white smoke at idle and lower rpm if i drive down the road it clears up, it didnt have smoke before well not white anyway before i had fuel pump problems im wondering if this could be from just having a lift pump running and not the injection pump or if im looking at totally new issue? any help appreciated thanks!

  3. #13
    Lifetime Member LB72004's Avatar
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    you need to rescale the table for the fuel pressure regulator current.

    adjust the current up some in the lower mm3 areas and zero out the 52000 and 60000. smooth it out and test it. keep adjusting the top few tables (low mm3) until it actual Mpa matches the desired Mpa during idle.

    when you get the idle Mpa worked out take it out for a drive and log the B1010 and actual vs desired Mpa. adjust the areas that don't match. higher current = lower pressure
    2008 Chevrolet 3500HD DRW LTZ
    285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

    Sold - 2004 LB7 Duramax, EFI Live with DSP5 Tune
    stage 4 SC transmission, 265/70/16 tires

  4. #14
    Lifetime Member LB72004's Avatar
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    having the LP turned up too high will do it too
    2008 Chevrolet 3500HD DRW LTZ
    285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

    Sold - 2004 LB7 Duramax, EFI Live with DSP5 Tune
    stage 4 SC transmission, 265/70/16 tires

  5. #15
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    LP is a PPE was factory pre set at 12PSI, I dont not own the EFI software yet because of my fuel issues the money i had set asaid for the EFI LIVE got ate up by the injection pump, is 12PSI to much? is that why im seeing the white smoke or could that be a different issue, i know its not head gaskets im not loosing any coolant or building pressure nor does exhaust smell like antifreeze

  6. #16
    Lifetime Member LB72004's Avatar
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    sounds like an injector problem to me. one or more injectors could be over fueling. a balance rate check could help narrow down which one(s). depending on how many miles are on these injectors, it may be time to replace them all.

    try turning down the LP, 5-8 PSi. and see how it runs.
    2008 Chevrolet 3500HD DRW LTZ
    285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

    Sold - 2004 LB7 Duramax, EFI Live with DSP5 Tune
    stage 4 SC transmission, 265/70/16 tires

  7. #17
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    NEW INFO grabbed my PPE handheld from my LLY to check out the injectors all seemed to be running 3.2MS at idle, except the #2 that one was weak/dead at idle however if i throttle it up a bit or go down the road that injector runs the exact same as the rest? strange let me know what you guys think about that

  8. #18
    Lifetime Member LB72004's Avatar
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    i dont think you can accurately check the balance rate at anything other then idle. check it in park an in D, with the engine warmed up. then tell us what the numbers are for each.
    2008 Chevrolet 3500HD DRW LTZ
    285/75/17 Nitto Dura Grapplers, 4.56 gears, Front and rear ARB lockers, Efi Live tuning by me, Raptor 160 LP, Cognito 4-6 NTB Lift, 4" Exhaust, Built Trans by Mike L.

    Sold - 2004 LB7 Duramax, EFI Live with DSP5 Tune
    stage 4 SC transmission, 265/70/16 tires

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