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  1. #1

    Default fuel guage problems

    when i fill up my 88 c1500 the guage only shows a forth of a tank.

    where should i start

  2. #2


    Unplug the connector at the tank and turn the ignition on. The gage should go up way past "full." Then ground the gage sense wire in the harness and the gage should read "empty." IF the gage responds correctly, then you have a bad unit in the tank (Most likely, this is your problem). If the gage doesn't respond correctly, then it's either the wiring or the gage itself.
    Good Luck and God Bless
    Remember that if you're not part of the solution, then you're part of the problem!

  3. #3


    ok tried it and guage responds but would the unit in the tank not being grounded to the frame be the problem

  4. #4


    The ground for the level sensor should be the same ground that the fuel pump uses. So if you have fuel flow from a running pump you should also have a good/adequate ground for the level sending unit.
    2010 Silverado LT 1500 5.3L 4X4
    '95 BMW K1100LT
    '97 BMW K1100LT

  5. #5


    i would check the fuel level sensor to make sure that it is not bad. sometimes the level sensors have a tendancy to wear out on a lot of things and then you will not get an accurate reading.
    Tony-1999 Chevy 1500 z71 4x4

  6. #6


    I just remembered that there was problem with the baffle inside the fuel tank coming loose on those trucks, which caused all manner of strange gage problems, from broken pickups and floats to just plain old hanging up. Take the tank off and look closely at the plastic baffle. It should not move inside the tank. It mounts on two or three studs with push nuts on them. I've fixed a ton of them, but they were a lot newer than yours at the time. You may have to find a replacement tank, especially if the baffle or the studs are broken.
    Good Luck and God Bless

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