I have a pair of SU carbs on my desk (from my MG B), in bits. same problem with over-flowing fuel. the float bowl's have some fine grit in them accumulated over the years (they're 35 years old..), so I'm cleaning/rebuilding. although a sharp tap would've stopped the leaking.
check your fuel filter is ok, as you have to wonder how the grit got in there. sometimes it just happens, and it's not worth tracking down. but if your filter is dirty then it could be time for a new one.
cheers
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