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If anyone can diagnose this problem, I'll buy 'em a cold one. I had my original 4100 Hi-Po carb rebuilt. It runs better than ever, but has a very weird problem. If I start the car and just let it idle, without driving it, the carb begins to leak from the inside out. If I return to the car a couple of hours later, a substantial amount of gas will have pooled up on the manifold. If I take her out for a drive it doesn't leak at all. I'm baffled. I've checked the fuel pump pressure and it is between 4.5 and 5.0 psi. I've ran this by everyone I know and looking for any ideas. Please help.

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You would have to dry the carb. and manifold, start the car and watch where the
leak is coming from. Is it coming from the accelerator pump or ? It is hard to
tell without seeing it. Could be a cracked fuel line or the housing itself.
Can you smell gas while driving?
Good Luck!
 

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If rebuilt properly, the carbs shouldn't leak (obviously). I'd check the outside accelerator pumps (primary and secondary ones), but especially the float levels (wet). The Ford Shop Manual and Mannel's book specifies the wet float levels (the better way to set your float) instead of dry float settings that the rebuild kits usually provide.

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