Question about 1996 GMC Sierra

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1996 gmc sierra 4.3l fuel injection

While driving down the interstate it started slowing down and sputtering and would only go inch by inch, then all of a sudden it started running okay. After we got it home it won't start now.

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  • clharris007 Mar 07, 2009

    how do you check the fuel pressure

  • clharris007 Mar 08, 2009

    After the fill up the truck was drove 152 miles one way, on the way back is when it started acting up.

  • clharris007 Mar 09, 2009

    The repair manuel says 60 to 65 lbs of fuel pressure. Would anything
    less be reason for it bogging down and could replacing just the pump
    motor improperly be a cause

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It sounds like a fuel contamination problem or fuel filter/pump problem. Did the problem start after a recent fuel fill, if not, has the fuel filter been changed at any time, if so, check fuel pressure. Pressure should be 30 to 40 pounds.
Let me know.
Regards,

Posted on Mar 07, 2009

  • Bruce Bracey
    Bruce Bracey Mar 07, 2009

    You will have to have access or purchase a fuel pressure gauge. After relieving fuel pressure in the rail, you will connect the pressure gauge to the injector rail schraider valve.

    When you turn the key to the crank position, the gauge should read 50 to 60 PSI for SFI systems.

    Let me know if you want to do that.



    By the way, did this happen after a fuel fill up?

  • Bruce Bracey
    Bruce Bracey Mar 09, 2009

    If it is down around the 50 to 55 range, it may be getting weak or the pressure regulator is failing.

    If the motor was changed seperatly, the fuel connection between the pump and cup could be leaking and causing a low fuel pressure problem.

    Have you checked the pressure yet?

    Let me know.

    Regards,

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