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I was also chasing a leak for a long time on my B. Turned out it was from the fuel inlet fitting (where the filter is) Threads in the carb body were worn, so could not tighten it up enough. Thought carb was junk, but my local parts store had a brass fitting that had longer threads that went further into the carb to unworn threads. No more leak! Thank God there are still some independent parts houses with 'real' parts guys, can't keep our old junk running without them.