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Thread: Fuel pressure and the GM 3800

  1. #1

    Fuel pressure and the GM 3800

    The Grand Prix has a fuel pressure issue on start up, the pressure is bleeding off somewhere over night or when the car sits for extended periods of time. If I click it over it sometimes starts or sputters and spits and chugs then takes off if I don't give it a little gas. I noticed if I click the key over and let the fuel pump prime click it off and repeat 2 more times the car fires up perfect.

    No check engine lights, and I replaced the fuel filter because it was cheap and easy.


    haven't really checked into anything else yet, been very busy with the Bullitt.

    Figured I would ask here and maybe Bob or Miff who has chimed in in the past might have an idea before I start really diagnosing where my pressure is bleeding off.

    leaky injector? fuel pressure regulator?
    2014 GMC Sierra SLE
    2001 Mustang GT Bullitt #2793 "The Terminated Bullitt"

  2. #2
    Parts Swapping Guru SATURN5's Avatar
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    Could be either, but I'd lean toward the FPR.
    84 SVO

  3. #3
    Founding Member jevchance's Avatar
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    Did you already change the filter? The connection on those can be kinda tricky. Its probably ok if its not leaking fuel, but still I'd swap out the filter.
    "Terrible, terrible, the way we have all bent to the yoke; the affection we have for the harness about us." - Isaac Asimov, The Dead Past

  4. #4
    filter was swapped first.
    2014 GMC Sierra SLE
    2001 Mustang GT Bullitt #2793 "The Terminated Bullitt"

  5. #5
    Senior Member Nuttsgt's Avatar
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    Quote Originally Posted by SATURN5 View Post
    Could be either, but I'd lean toward the FPR.
    Try pulling the vacuum hose off the FPR, fuel shouldn't come out of it.
    Eric

    Quote Originally Posted by kansaschance View Post
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  6. #6
    Founding Member jevchance's Avatar
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    Quote Originally Posted by Puddles View Post
    filter was swapped first.
    Are you confident you got that quick-clip connector on there right? Its not leaking at all is it?
    "Terrible, terrible, the way we have all bent to the yoke; the affection we have for the harness about us." - Isaac Asimov, The Dead Past

  7. #7
    Quote Originally Posted by jevchance View Post
    Are you confident you got that quick-clip connector on there right? Its not leaking at all is it?
    nope, no leaks.
    2014 GMC Sierra SLE
    2001 Mustang GT Bullitt #2793 "The Terminated Bullitt"

  8. #8
    Dudley Do-Right HIVOLTJ's Avatar
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    Fuel pressure regulator is notorious for leaking on those. Could be a bad check valve in the fuel pump also
    Beauty is in the eye of the beer holder

  9. #9
    I've changed fuel filers on cars with a lot of miles. then within the week, they need a fuel pump.. I honestly dont know why, but its happened to me three times. granted, the fuel filters I changed were extremely dirty, and had probably never been changed before. this ever happen to anyone else?

  10. #10
    Kind of interesting.

    I pulled the GP in last night to dig deeper into the fuel pressure thing.


    I put the gauge on, 50 pounds at the rail 55 when the key is on.

    car starts fine now. wtf
    2014 GMC Sierra SLE
    2001 Mustang GT Bullitt #2793 "The Terminated Bullitt"

  11. #11
    Parts Swapping Guru SATURN5's Avatar
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    Little high unless that is with the vacuum line disconnected. Usually, it's 43 psi with the line on.
    84 SVO

  12. #12
    Founding Member jevchance's Avatar
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    Quote Originally Posted by kansaschance View Post
    I've changed fuel filers on cars with a lot of miles. then within the week, they need a fuel pump.. I honestly dont know why, but its happened to me three times. granted, the fuel filters I changed were extremely dirty, and had probably never been changed before. this ever happen to anyone else?
    Less back pressure maybe?
    "Terrible, terrible, the way we have all bent to the yoke; the affection we have for the harness about us." - Isaac Asimov, The Dead Past

  13. #13
    Quote Originally Posted by SATURN5 View Post
    Little high unless that is with the vacuum line disconnected. Usually, it's 43 psi with the line on.
    No vacuum disconnected
    2014 GMC Sierra SLE
    2001 Mustang GT Bullitt #2793 "The Terminated Bullitt"

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