eric meant route the AIR VENT (atmospheric) lines the airbox. that's good practice.
the other line (the one coming from the bottom of the carb is the overflow line - thats where the fuel goes when it crest the peak of the bowl....look at your bowl next time, there's a tall point in there.
back to my original question. why did you do this? did you have a float problem? I'm trying to determine if YOU caused the problem or if the problem existed, and still exists.