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What causes the fuel to drain out of the float bowl when the engine is NOT running?

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jeepsterdave
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Discussion Starter #1 (Edited)
I have an early 1988 YJ Wrangler with a 4.2 liter engine.
It is completely original and UN-restored including the carburetor.
The problem I am having is when it sets for more than 4 or 5 hours the fuel drains out of the float bowl. then I have to grind on the starter to get fuel back in the carburetor before it will start. If it only sets for no more than 4 hours it will start right up.

Has anyone had this problem and if so what is causing/allowing the fuel to drain out of the float bowl?
 
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