What causes gas tank to make a poping sound? on 1998 Chevrolet S10

at different times I smell gas fumes. I hear a popping sound come from the gas tank. I can be parked and it running and it pops or a few minutes after turning off engine I will hear a pop from the gas tank. Does anyone know why it is popping? Has anyone else had this problem? thanks Donna

by in Fort Gay, WV on June 23, 2011
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1 answer 2 comments
ANSWER by , June 23, 2011
expansion and contraction. you have a problem with the evap system that is allowing this to happen. take it to a shop and have them check this for you. Roy
COMMENT by , June 23, 2011
thank you Roy, yes I will take it to a shop for them to look at it. Will this problem also cause vehicle to use more gas? Thanks Donna
COMMENT by , June 24, 2011
no, not really. let a shop help you. make sure you ask that question and have them look at it for you. Roy