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

Asked by for the 1998 Chevrolet S10
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.

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
no, not really. let a shop help you. make sure you ask that question and have them look at it for you.