According to what I read, test the gauge first. Hook power to where the white wire attaches. Hook a ground to the black wire connector. The gauge should rise to full. (May take a while). When on full, the tan wire connector to same ground. It should go to empty. If both work, gauge is good. To test sender, in the empty position, your ohm meter should read 0-2. 1/2 tank should read about 40, and full should read 84-88 ohms.
SOURCE: removing dash board from 1969 chevelle
you will find bolts in the defrost air vents and under any speaker covers. also in the glove box. make things easy and remove the windshield first. can be done with the windshield in place but much harder.
SOURCE: my gas gauge on my 93 ford mustang quit working.
i suspect a broken wire between guage and sender unit in tank, but the sending unit could be bad,find the wire to the float guage in the tank and disconnect it, if fuel level does not change then then touch the wire to a ground, if the guage changes then the wire is ok and the unit is bad, if it does not change check wiring and guage for faults.
SOURCE: gas gauge reads full when underway. However, when
Most likely it a bad fuel level sensor on you fuel pump. You will have to replace the fuel pump as that is the only way to replace the sensor for you fuel gauge. The sensor is built into the fuel pump. The contacts on the sensor become corroded over time and cause the sensor to malfunction causing your fuel gauge to read full all the time. I have a 2001 Montana extended version that had the same problem. In order to know when I needed to fill the tank, I would completely fill it each time I put fuel in and reset my trip odometer. I would go 400 miles on the tank before I would refuel until we were able to replace the fuel pump.
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