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Does it read correct all the time except when it's in the range that you described? Or does it only display the range that you're talking about, even after a fill-up?

Maybe the needle got loose off the post? That's your best bet for an easy fix. The sending unit is in the tank.

NOW, on another note I have heard rumors that there is an issue with this if you leave the keys in the ignition when refueling. (Do you do that)? The computer gets all goofy and you need to get something reset or reprogrammed.
 
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