When I used to overfill my tank so much that gas came out the vent tube (dumb) I would smell gas. Not to strong but it was there. After I ran the engine for short while the smell would go away.
I finally put 2 +2 together and removed the vent tubing. It was made out of some sort of cheap rubber. I couldn't see any evidence of deterioration. None the less I replaced the vent tube with ethanol rated tubing and quite overfilling. No more gas smell.
ex TRUE GRIT
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