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1999 Chevrolet Cavalier Question: Gas gauge is not accurate, floats back and forth

 

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chevyford_dude, 2.2L 4 Cylinder, Cincinnati, OH, August 23, 2010, 13:08
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 Enthusiast

Hi,
My gas gauge on the instrument panel does not accurately report the fuel level. In many cases it will lean toward the full mark. Once in a while it will accurately go to the correct level, but then will float back to the full mark or close to it. My fuel pump is working fine. Any suggestions?

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  • Medium-star Best Answer
    August 23, 2010, 17:14
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     Master

    Chevron has a fuel system additive called Techron Concentrate Plus. The formula with the "Plus" is specifically designed to help with this very common GM problem--it's caused by corrosion on the fuel sending unit in the gas tank.

    If a couple of tanks with the Techron Concentrate doesn't work, then you are probably out a bundle for the fuel sending unit.

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    chevyford_dude, August 24, 2010, 06:40
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     Enthusiast

    Ok, I will try that. thanks for your quick response.

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    melm1974, January 25, 2011, 21:16
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     Enthusiast

    ya, after a 1/4 , mine likes to float too.

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  • Answer #2

    Visitor, September 21, 2010, 08:33

    Cheveron is temporary fix if it works at all. You will need to replace the sending unit inside the tank itself to insure trouble free problems again. Oterwise you may be looking for a ride to a gas station on the highway.

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    Visitor, September 22, 2010, 06:30

    Thanks for pointing that out. You can easily monitor your mileage to avoid running out of gas whether the gas gauge works or not.

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    cadplan, November 26, 2010, 14:59
     Rookie

    I replaced the sending unit in my 97 Buick LeSabre and it still reads full all the time. Wish I knew what is causing it.

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  • Answer #3

    January 12, 2011, 10:06
     Rookie

    why does my gas gage go back and forth and what will it take to fix it

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