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Thread: Help with why gas-gauge is not working?

  1. #1
    Join Date
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    Default Help with why gas-gauge is not working?

    Disclaimer: I'm not technical. What are the most common reasons a gas-gauge does not work?

  2. #2
    denverd1's Avatar
    denverd1 is offline Level: Uber Jeep Cherokee Trailer Queen
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    Default Re: Help with why gas-gauge is not working?

    bad ground to the gauge/pump *I think*. Mine only works when its low. top it off when I go ride and it works for me!
    Wheelin' East Texas in a RED XJ

    RED 98 XJ with 4.5" lift, ZJ steering, front and rear locked on 33's
    cowl intake, Cobra CB, SYE, bumpers, 10K winch, lights
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  3. #3
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    Default Re: Help with why gas-gauge is not working?

    Crist, the way it works is that when you turn on the key, power goes directly to the gauge. Then through it to the sending unit. The unit then acts as a variable resistor, changing as the fuel level changes. The power goes from there to ground. If the gauge doesn't work at all, then probably the power is not getting to the sending unit. If it only works a little or incorrectly, then it is usually a ground issue
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
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    And a bunch of other stuff

  4. #4
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    Default Moving on...

    Poked around a bit today... No progress. Trip to the local mechanic for help.

  5. #5
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    Jan 2012
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    Default Re: Help with why gas-gauge is not working?

    Mine is off by quite a bit, I think I need a new float which on mine is part of the whole fuel pump/filter assembly in the tank and isn't a cheap part

  6. #6
    nickyg's Avatar
    nickyg is offline Level: Uber Jeep Cherokee Trailer Queen
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    Default Re: Help with why gas-gauge is not working?

    mine always reads a quarter a tank lower then whats in it. example. full tank shows 3/4. It drove me crazy for a while now I'm use to it.
    One more part and I'll have a new Jeep

  7. #7
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    Default Fixed!

    What I learned: The gauge-needle is moved by magnets driven by 1-ohm to 88-ohm(full-tank). Applied voltage... Watch the needle go ♬ up-and-down, up-and-down ♬. Cleaned terminals on sending-unit and applied dielectric-compound. All is good in Désirée land again!
    Last edited by Crist Clapper; 03-18-2015 at 08:39 PM.

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