FAULTY GAS GAUGE

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EVERY SO OFTEN, MY GAS GAUGE REFUSES TO MOVE WHEN I START THE CAR. SOME TIMES IT WILL STAY THAT WAY FOR DAYS, AND OTHER TIMES, IT WILL GO BACK TO NORMAL THE NEXT TIME I START THE CAR. I'VE NEVER ENCOUNTERED THIS PROBLEM, OR ANYTHING LIKE IT, ON ANY CAR I'VE EVER OWNED.