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Are you talking about the vent line that runs from the top of the carb and looks like it hooks up under the gas tank/petcock?
When I was installing a fuel filter, I had the petcock set to PRI and the vent line disconnected. Until I plugges that line, the gas wouldn't stop flowing. It might be possible that the vent line has a flaw which allows air to seap in and is causing the constant running. Maybe you can replace that or at least inspect it.
It is a vaccum line which causes the fuel to be pulled into the system. If that vaccum isn't sealed, the result might be what you are experiencing.
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