The vent can and should be plugged, if the whole charcoal can setup isn't there. There is no one size fits all with squirters. Do not enlarge them if there isn't a problem getting out of the hole.
This^^^^^ you can plug the hole in the carburetor where the tube is already out, or, reinsert the tube like I described and slide a rubber plug over it. It's not the float bowl vent. It runs to the charcoal canister as described and if you don't have that, then that line is not needed.
