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Q:

gas guage sensor problems on 2000 Buick LeSabre

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
My gas gauge is not reading correctly
(1) Answer
The gauge sensor in the tank may be defective, or the wiring to the gauge or the gauge itself may be bad.
What I would do first is get a bottle of Chevron Techron Plus http://bit.ly/Techron_Concentrate
Use this according to the instructions and see if it helps. The fuel level sensors can become dirty and the Techron will clean the sensor, see the link for more info.