I HAVE A 00 BUICK REGAL 3.8 S.C. FIRST MY GAS HAND WOULD ALWAYS STAY ON FULL NO MATTER HOW MUCH FUEL WAS IN THE TANK. SOMETIME IT WOULD MOVE TO WHERE I THINK IT SHOULD BE BUT QUICKLY GO BACK TO FUEL AND STAY THERE. I WAS GOING TO TRY TO REPLACE THE LEVEL SENOR ON THE FUEL PUMP BUT I CAME ACROSS A REBUILT FUEL PUMP FOR JUST A FEW MORE BUCKS THEN THE SENOR ITSELF. I WAS TOLD ALL PARTS WERE NEW ON THE PUMP INCLUDING THE SENOR THEY JUST REUSED THE PLASTIC HOUSING. AFTER REPLACING THE PUMP THE GAS HAND GOES TO FULL AND THEN GOES TO EMPTY WHERE IT STAYS and light comes on. is there anything that can cause this problem other than the senor on the pump. thanks for any help.