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One issue with the float valve is the nut. When they machined the hex they slightly deformed the sealing surface on the opposite side. That periodic (6) wave make it very hard to seal completely.
Fuel would slowly leak out and accumulate. Fire could be a risk.
I sanded the surface smooth Using a block with a hole in it. 600-800 grit sand paper with the same hole. Slowly spin the sealing surface against the sandpaper. Initially you will see the (6) ridges. Keep going until the whole surface is smooth. Reinstall with a new seal and it won’t leak.
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