[Opentracker]

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!

 

[Midlife]

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.

http://clubs.hemmings.com/baymustang/platesmall.jpgLet me check your shorts! My multimeter is just a-waiting! Formerly known as Midlife in the old VMF.
King of the Old Farts *struts*