Question about Chevrolet 1500

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Replaced the fuel pressure regulator, turned motor over one turn and gas is running out of number 5 cylinder and about 10-12 ounces of fuel came out. All other cylinders seem to be getting too much fuel also.

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  • John Cervenka Jul 21, 2009

    It is a 1998 Chevy C1500 305 V-8, the original problem was that I was not getting any fuel past the the metering valve, so I replaced the fuel pressure regulator. Now I am getting to much fuel into the the cylinders.

  • John Cervenka Jul 21, 2009

    Also you mentioned vacuum lines running to the regulator well when I removed the black cover there was no vacuum lines running to the regulator.

  • John Cervenka Jul 22, 2009

    Thank you for the advise. I replaced the metering valve and injector assembly and now the truck runs good.



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First could you please give me the make, model, and year of the car in question. The problem you are having, was this the reason you first replaced the fuel pressure regulator?

The fuel pressure regulator is operated by vacuum lines, and usually it would have a leaking diaphragm, which would allow raw gas to be sucked into the vacuum line but since this one is new I doubt that is the problem.

There are also a couple Orings, and a gasket in the throttle body that could leak gas into the manifold also which is where I think your problem lies, so this is where I would start checking first. Let me know how this turns out.


Posted on Jul 21, 2009

  • Benjamin Patri
    Benjamin Patri Jul 21, 2009

    Ok, now that I know the model and year that helps a lot

    The fuel injector and regulator on this truck is a unit witch sits
    inside the intake plenum. usually the injector will start to leak or
    the regulator. Regardless the fix is a new assembly. The injector
    assembly has 4 lines and poppet valves on each side. These poppet valves
    have a tendency to stick open or crack as well. Sometimes you can remove
    the MAP sensor on the intake plenum and take a look inside with a
    flashlight if its all wet in there you've definitely got a leak. Only
    other way to inspect the injector is to remove the plenum, not too big
    of a job but you will need a plenum gasket set. Let me know what you find with doing this.



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