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Thread: 2011 gmc 6.2 /4l80e help

  1. #21
    Senior Tuner edcmat-l1's Avatar
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    "Every time I look at it it's XX psi"....

    EFI specialist
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  2. #22
    Quote Originally Posted by edcmat-l1 View Post
    Post the tune file.

    Put a fuel pressure gauge on it. One you can tape to the windshield so you can watch it while you drive.
    will have a fuel pressure gauge hooked to so i can view while driving
    will scan and video the fuel pressure at the same time

  3. #23
    cant seem to add a video

  4. #24
    What in tankkpump can I use
    The gauge shows 60 at idle but goes to 20 under load
    Using a corvette fuel regulator/filter
    And pressure do not increase when return is blocked off

  5. #25
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    Yeah that is a problem. It's likely just a bad pump.
    Tuner at PCMofnc.com
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  6. #26
    Senior Tuner edcmat-l1's Avatar
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    Quote Originally Posted by laurieandmike View Post
    fuel pressure stays at about 60psi
    Quote Originally Posted by edcmat-l1 View Post
    That's what everyone says and around here it's code for 'I haven't really checked it, I'm assuming'. Your MAF table is already doubled. Granted they do need recalibrating when you move them like in a swap vehicle, but with it being doubled I'd suspect low fuel pressure.
    Quote Originally Posted by laurieandmike View Post
    What in tankkpump can I use
    The gauge shows 60 at idle but goes to 20 under load
    Using a corvette fuel regulator/filter
    And pressure do not increase when return is blocked off
    BOOM Called it days ago.....

    I could tell by the MAF table it had been "tuned" with low fuel pressure.

    EFI specialist
    Advanced diagnostics, tuning, emissions
    HPtuners dealer and tech support
    email=[email protected]

  7. #27
    Quote Originally Posted by edcmat-l1 View Post
    BOOM Called it days ago.....

    I could tell by the MAF table it had been "tuned" with low fuel pressure.
    dadnewpump.hpl

  8. #28
    works better but still issues
    Attached Files Attached Files

  9. #29
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    Any tuning done with a bad fuel pump will have to be redone. Or if none has been done, time to tune it.
    Last edited by gtstorey; 3 Weeks Ago at 02:30 PM.

  10. #30
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    It's very rich now but a lot could be fixed just setting PE to something more reasonable.
    Tuner at PCMofnc.com
    Email tuning!!!, Mail order, Dyno tuning, Performance Parts, Electric Fan Kits, 4l80e swap harnesses, 6l80 -> 4l80e conversion harnesses, Installs

  11. #31
    has everyone can see i am very new to this
    where abouts would i start lol
    only thing done to this has of now is vvt zeroed out
    dod disabled
    with the new walbro intank pump the gauge off the rail is showing 68 ish pounds and dont seem to drop out undr load like it used too
    corvette style fpr with return
    thanks everyone for the help so far

  12. #32
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    Showing 68 psi or 58 psi?

  13. #33
    befor i changed the pump it would show 58psi and drop out to 20ish under load
    now gauge shows closer to 68psi and drops to say 65
    thats using the corvette filter/regulator/return line setup
    its located close to the tank
    i am getting the pressure readings from the port on the fuel rail
    injectors are stock

  14. #34
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    Corvette Regulator/Filter should read 58 psi. Either your pump is overloading the regulator or a crappy regulator or both. Both show up fairly often on here.

  15. #35
    i am sure the pump is over powering the regulator now
    what would you guys suggest for a decent regulator?
    thanks

  16. #36
    Gss341 walbro is the pump