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I've seen that with mine and assumed it was just normal - never had it correlate with not starting, etc. Engine's hot, everything's hot, so yes - probably gas is very hot too; thus the bubbles. I suspect it's not much to worry about. Gas boils out of the carbs too - down into the cylinders. Do you have good insulating spacer between the fuel pump and crank case? (the thick one)
Jason
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