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You may have a unique problem!!! Normally I would say it is the sending unit- in the fuel tank!!!! But Buick LeSabre had a weird thing happen from time to time. Look closely at your fuel guage and focus on the PIN that acts as a stop for the fuel guage to not go beyond the Full mark. Make sure the pin is on the correct side of the pin!!! Sometimes the needle will somehow jump the pin on "E" or "F", and literally hold the needle in place.
If the gauge is pegged beyond full, 99% of the time it's a bad ground by the tank. I can't go much farther from lack of details....mechanical fuel pump or electric? Has the gauge ever worked?
In the long long ago,..my dad would literally drive off large curbs to
" jostle " the float from hanging up in the tank. Nice trick, but not always the issue.
The most likely culprit is a faulty Fuel Level Sending Unit (sends fuel level from tank to dash gauge). It may be stuck, or beyond repair and in need of replacement. Dealing with electronics in your tank can be tricky and should be dealt with by a professional.
It is either the sending unit in the gas tank or the dashboard gauge, either job poses its own challenges take your pick. If it is the gauge if you were lucky in a couple of weeks it will become unstuck in to pegged out position but that is only if it is a mechanical issue with the needle itself wedged in place.
Sounds as though the tank sensor is faulty. Access through top of petrol tank, note the wiring colours and position. Lift out and check condition of float and the rheostat wiring and slider. Get a replacement from EB spares