I replaced the sender (Moeller, I think), vent and fill lines with legal hoses (A1/A2 or B1/B2 as appropriate) within the past year. I managed to overfill it until it came back out the fill hose this summer. After I mopped it up and ran the motor long enough to drop the fuel level below the fill hose to tank joint, then I had no odor of fuel. I didn't like paying for the new low permeability hose, but it really does work.
I have a 20 year old aluminum tank, for whatever that's worth. I would check hoses first, and think about a ethanol embrittled fill or vent connection. Especially if our tank held pressure last time you checked. The fill hose I yanked looked pretty bad.
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