Question about 1997 GMC Sonoma

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1997 sonoma fuel gauge not working. Shows empty or just above empty all the time.

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  • Greg Bernett
    Greg Bernett May 11, 2010

    What size motor?

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Possible in tank sending unit .Disconect tank harness and jump 2 wires (not pink/ black) to verify harness and gauge .If gauge moves with jumper,you will need to proceed with tank removal in order to access the top lock ring which secures the assembly and service the sending unit.

Posted on Jul 29, 2009

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Well in order to tell if its a fuel sending unit problem or the gage in the dash you must have a scanner.There is a 50% chance on both of them,unless you have a friend with a scanner you cant tell.

Posted on Jul 29, 2009

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1 Answer

Why won't the fuel gauge work?


The power wire from the sending unit runs to the gauge. Since it is showing 3/4 all the time. It is a break in the wire or really high resistance. I would check resistance of the ground wire first. If it is good(less than 5.0 ohms), I would replace the power wire from the pump to the gauge. I assume the gauge goes to empty with the key off. If not the gauge is bad.

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1 Answer

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My experience is with a 98 and a 99 cavalier but I don't think the changes from 97-98 included the cluster, so here's my experience. There is no designated warning light for the fuel gauge. When the gauge gets to almost empty(just a millimeter or so above empty) the red "check gauges" light will illuminate. I don't know whether you have had the tank this empty or not, but periodic checking of the cluster should make you notice if the level is this low. Hope this helps, it's all I can say with the info posted.

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1 Answer

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Remove the sender wire from the fuel tank and short it to ground (metal part of tank).

If the fuel gauge goes to full then your sender unit is faulty and replace it.If not ,please come back to me .

Please leave positive feedback if you feel I have helped you.

Thank you

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1 Answer

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was the car left for 5 weeks empty of fuel?

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