Thread: gas hand

ok ive got a 03 se and my gas hand is very weird,when i first start the car over the gas could be at the top of the little yellow square and the light is not on yet but when it runs for a few minutes it will drop way below empty,i can turn the car off and then the switch backover and it reads right,what would be making it drop like that

i havent toped it off but its had exactly a half of tank and has went down about 4 lines while driving for a very short distance and does it at idle to