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It is either the sender unit in the fuel tank, the wiring for that, or the guage itself.

Some have the sender inside the fuel pump, which kind of means replacing the whole pump.

Check the wiring first make sure its not corroded and is secure.

If the wiring is ok, then chances are its the sender or the gauge.

Only someone who knows what they are doing can adequately test the gauges.

You should take it to an auto electrician many will test it for free give you a quote on fixing it, others will charge a fee just to look at it.

Try and find one who will check it out for free and give a quote so you know what you are up for.

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Q: My fuel gauge goes for full to empty after i start the car and the fuel tank is full?
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