Question about 1998 Chevrolet K3500

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1998 K3500 5.7 gasoline truck cranks, but will not start. Found low fuel pressure @ about 35 PSI. Replaced fuel pump assembly in the gasoline tank, started truck drove it home, but next day it wouldn't start, I measured fuel pressure, and now have 60 PSI fuel pressure, but engine will start, only if I pour in a little gasoline. This must be an electrical perhaps missing an input signal to the computer, since some common signal enables the fuel injectors to fire. My assumption is the fuel injectors are not turning on. I do not have a schematic diagram of the computer wiring, so do not know what to check next.

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  • boolsifter May 27, 2008

    I have changed the air filter.

  • boolsifter May 27, 2008

    If the problem were caused by dirt in the fuel tank, wouldn't the symptom be low fuel pressure? If I have 60 PSIG at the fuel injector rail, and can press the valve button on the guage and get a solid squirt stream, then it would seem I have unrestricted fuel supply to the fuel injector rail.

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  • Master
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A few suggestions:

Check the air intake and see if it is dirty, plugged air filter. you can clean with a good air intake cleaner...follow instructions on the can.Those years were noted for problems in the dist cap. check it for cracks.

Check the pressure regulator it is on the left side fuel rail on the engine.

I would for sure test it before just replacing it. Test it with a fuel pressure tester.
Dirty injectors could do the same thing.

Low pressure could also be from a worn pump.

Posted on May 27, 2008

  • Georgia B
    Georgia B May 27, 2008

    Also, if it has Central point injection, a tube may have split or come
    off a poppet, and is dumping fuel in the manifold, rather than spraying
    it in the intake runners

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  • Master
  • 3,614 Answers

Check also the air filter.

thank you

Posted on May 27, 2008

  • micromaster
    micromaster May 27, 2008

    - well you must clean / flush the gasoline inside the tank, to be sure that there was no dirt was mixed into the gas, and that's why its making your ignition hard to start...



    thank you

  • micromaster
    micromaster May 27, 2008

    i'll see if i can find also a schematic diagram you need..

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