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Q: Fuel gauge malfuctions: Dial rapidly rotates clockwise to 7:00 o'clock on 1997 Buick Park Avenue

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Problem has been occurring for several years. GM dealer tech removes panel and manually rotates dial counter-clockwise to empty...then charges me $75 for 1 hour time, their minimum charge. Keeps occurring over and over. Dealer tech can find no help in their GM factory computer repair program.
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The gauge sending unit in the gas tank has a position where the wiper does not touch the resistive pad. When this occurs the gauge gets the maximum voltage which drives the needle all the way around to the back side of the resting pin. In the car I own this only happens when the tank is almost empty and the gauge is in the red. To save money I just keep my tank above 1/4 and it's fine but the real solution is to replace the sending unit in the tank.

I would defenitly test the new sending unit on the bench with a multimeter to make sure the replcement sending unit does not do the same thing. I would also recomend an aftermarket part, aftermarket manufacturers tend to resolve OEM part problems in their designs.
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