Ground the gauge signal wire at the tank and see if the gauge reads empty.
A open circuit will cause the gauge to max out "full" on the dash. A short to ground will cause it to read "empty" If you ground the signal wire and the gauge reads empty, it would indicate the sending unit is faulty.
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I drive a hybrid, It burns gas and rubber..
Alcohol Tobacco & Firearms should be a convenience store, not a government agency.
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