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Mysterious Leaking Carburetor

526 Views 2 Replies 2 Participants Last post by  Midlife
G
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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The G-Man's '65 K-code Fastback
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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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