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I've been doing some research and this is somewhat of an issue.. I've noticed recently I fill up to full it will go JUST before full but never over it, but I can't fill anymore?
I've drained the tank completely and filled it back up thinking it was bad gas but it sounds like it can be fuel tank sensor?
 

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My car did this for the last month! It was cutting me short by ~2 gallons from full. Normally the needle will sit just above the full mark, but it was stopping just below.
As of last week, the past 3 fill ups have been back to normal. :confused:
 

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Check all connections & ground points involved with the sending unit & gauge. It takes only a very slight increase in resistance to throw off your reading.
 
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