1991 Pontiac Bonneville Q&A
1991 Pontiac Bonneville Question: my gas gauge is acting weird?"
You should check out the fuel level sensor in the fuel tank. You will need a repair manual that includes the specifications for the sensor and a meter to measure the signals to and from the sensor. - Bret Bodas
sometimes when you have a bad grounding wire to the fuel tank or sending unit it will make the guage read full - Visitor