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Typically when a fuel gauge reads incorrectly it is the fuel sending unit in the fuel tank.In order to determine where the problem really is accessing the fuel sending unit on newer cars is fairly easy.Most have a access area either from removing the bottom of the back seat or from the trunk area under the carpet.In short if the fuel sending signal wire is grounded it should make the gauge either go back to empty or to the full mark IF it is not working properly.Just a simple check to verify if the part above is defective,or possibly your gauge itself has a electrical issue.I just recently fixed a exact issue as I have done before gauge read full and already knew the problem.

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Q: Why does my 2002 Kia Spectra fuel tank indicater read full all of the time?
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