Spot on, called vapor lockI’ve come across this problem. It drove me nuts until I did some serious digging into some really old motor manuals. First off, trace the fuel line from the tank up to the carb. Make sure there are no kinks, bends, pinched lines or any other mechanical problems. Next, since you have a carb problem, pay very close attention to the fuel line once it enters the engine bay (compartment). Is the fuel line touching anything hot! The exhaust manifold is a serious problem to fuel vaporization. Make sure there is a gap between the fuel line to any metal engine parts. My specific problem arose from the metal bodied fuel filter coming in contact with the engine. Even rerouting didn’t work for me because I didn’t have a method for putting a cooling feature on the line. By cooling feature, I mean putting a shield between the line and the hot engine. If you have some back yard engineering skills, making one up is quite easy. I used a piece of thin steel sheet and attached it to the fuel line so that heat from the engine couldn’t reach the line.
I hope this helps.
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