fuel guage on 2000 Chevrolet S10

On my 2000 S10 my fuel guage dose not work for example when the gas tank is full i could be sitting at a stop light the the gauge will go down on empty when i know i have a full tank. Any suggestion.

Asked by for the 2000 Chevrolet S10
This is a common problem, as far as we have heard, with GM trucks. It's often due to corrosion on the fuel sending unit in the tank. Sometimes this requires replacement of the entire pump module, and sometimes you can fix the problem with a bottle of Chevron's Techron Concentrate Plus additive. It has to be the "Plus" version.

Let me know how this turns out.
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