Fuel tank venting

As mentioned above, I would go with the original vent tube into the engine bay and connect it to the "carbon can" system. The carb would vent to it too. I would go that route, you just need the second fuel line.

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There are 3 tubes in your pic, 1 from the filler neck or tank, 1 to the carb or intake cover. Where does the 3rd go?