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hello all. 69chevelle 350. I had about 1/4 of a tank everything was working find when i shut the car off, 30 min later I started the car and the needle went past full all the way to the middle of the temp guage. when i shut off the car it creeps back to full. The only thing I did so far is disconnect the unit from under the dash and fill the tank. It did not work

could the float be stuck?
 

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you might have lost the ground wire between the sender and the frame, should be the brown? wire, the other wire to the sender may not be making contact in the wiring harness plug inside the trunk.
 
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