Contacted Mikes carburetor (seems like a decent guy) and he told me that after a carb rebuild (which I did) a very common issue is grit from the fuel system flushes through the carb and sticks in the needle and seat. I didn't believe it cause the needle and seat were brand new and they held air when I blew through a tube connected to the fuel inlet. But I knew floats were ok and fuel pressure was around 4 psi so I replaced needle and seat. Presto - fuel stopped leaking from EVAP cannister...
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