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Originally Posted by Rescue11
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I have this problem on a number of Cubs with both the Command and the Vanguard engines. Some start right away after sitting for a week or so. Some seem to take a long time to light off.
Is it the fuel pump? Don't know. I've changed fuel pumps and didn't fix the problem. Is it heat boiling the fuel dry after shut off? Don't know but I've tried using a check valve in the fuel line to prevent the carb from gravity flowing back to the tank. Didn't work.
I suspect the ones that are hard to start after sitting are running hotter than they should and are evaporating the fuel out of the carb when shut down.