Hi,
Typical for concerns such as yours would be the sending unit inside the tank. In some cases, it would just be a connector that has been disengaged, loose or corroded, often however, it would be the internal float and the position sensor. A quick temporary workaround is to use carb/injector cleaner to be poured inside your fuel tank. It is intended to clean the fuel system from the tank to the injectors and in so doing also cleans the sensor. Of course the correct procedure would be to bring down the tank, remove the sending unit and physically clean the inside or replace.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards. Thank you for using FixYa.
Sorry, I need to rephrase the problem \ question.
When I need gas the light comes on. I'll fill up and the gauge registers a full tank. If I drive a 100 miles it still says full tank. When I need gas again the light comes on and than the gauge reads empty. PLEASE HELP.
Thanks,
Joe
SOURCE: gas gauge doesn't work
Sound like a problem with the fuel sending unit; generally is attached at fuel pump.
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SOURCE: 1993 crown Victoria gas gauge doesn't work always reads full
Your fuel pump may not be working properly
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