Gas tank venting on a 163cc Briggs mower engine

I’d drill the tiny hole in the gas cap and move forward. I’ve done this before and put a fuel filter inline.
Other option is spend $$ for a replacement gas cap.
It’s great you isolated the problem.
Thanks, The Hole is drilled and I mowed for an hour yesterday with no problem. This is a very nice mower. Easy to handle and it mulches superb.
 
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