Join Date: Dec 2002
Location: Saint Louis, Missouri
Re: Bad Gas Guage?
You need three things for the fuel gauge to work (as well as the gauge itself). You need ignition 12 volts, a ground, and a variable resistance from the sender.
Testing at the trunk does reveal things but not always so what a person needs to do is verify they have an ignition 12 volts and ground at the gauge. If you have those two things, disconnect the sending unit wire in the trunk and then back at the gauge turn the ignition on and see if the gauges needle is at full or above. You then need to do a second test to verify the gauge works and to do this you then short the sending unit stud on the back of the gauge to ground. The needle should then swing to empty or below (and you have to have the ignition switch to the run position). Now disconnect this wire from the gauges sending unit stud and the needle should then swing to the full or above mark.
If you get the needle to move to full and above and then to empty and below, then the problem is from the sending unit stud back to and through the sending unit in the gas tank and then to the point the sender is grounded.
If the gauge does not respond, one problem is the gauge is not working and you may still have other issues once the gauge is replaced and retested.
1974 Spirit Of America Nova (being restored), 1973 Nova Custom, 1968 Chevy II (Garage Find 2012)
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