Why would my gas gauge stop working after a fill up? on 1990 Buick LeSabre

My gas gauge was working fine. I went in to fill up my car and after I was done the gauge only read a half a tank. I know the car is full of gas. Do you have any ideas what it could be? Thanks.

by in New Castle, IN on February 04, 2014
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1 answer 2 comments
ANSWER by , February 04, 2014
The in tank sending unit is most likely the cluprit!
COMMENT by , February 04, 2014
Crap! Its going to be one of those days. Oh well. Thanks.
COMMENT by , February 04, 2014
U welcom,, sorry! At least it shows the tank is "half full" think positive! If it works from that point to empty, it's better than not at all.