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2021 MR Triton
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Is the underside of your tank wet? or looking clean in one area in particular?

Probably a leak top seal or split breather hose
 

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I just purchased a 2003 galant es 2.4. I filled up the gas tank and now there is a gassy smell when at idle or sitting. Not when driving. What could this be?
Try removing the rear seat. There should be an access panel for the fuel pump. My Lancer had something similar to your problem. The elbow that connects to the hose had a crack and was leaking a little bit. Just enough to notice the smell when idling.
 
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