Q: What's going on when gas is constantly slowly leaking from where the gas cap is and the cap was not under pressure when opening?

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I filled my car up with gas yesterday evening and when I got home I smelled gas. I didn't drive this car today. I noticed gas just dripping from where my gas top is. I took cap off and gas is literally at the hole just sitting and dripping. What's wrong?

My car has 96656 miles.
My car has an automatic transmission.

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