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a couple of things could cause this. depends on what kind of car. the wires could some how be shorting out to the guage itself. the guage could b bad. if the fuel pump is in the tank you will have a floater in there that could be off or the pump itselfcould b bad. sometimes you can oil the needle on the guage itself and it will start working again.

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Q: What would cause fuel gauge bad reading?
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