I have a Brelleli 46 that I haven't used for about a year. There are 3 lines off of the carb. One goes to the crank case, one goes to the fuel tank, and the other on is the one in question. I can't remember what it was used for. I think it just got plugged and not used but it's been over a year since I put it to use.

I hope someone can help me out here.

thanks
Scott

Plugged if it was like the one i had. Mine had a Tiloston carb on it[:'(]

The other line is a pressure equalizing line that should run back inside your fuselage. I had the Zama and I now have a Walbro. It was needed for both. In fact I installed a nipple on the Walbro and closed up the local vent just for that purpose due to mixture problems in flight.

FYI - it is Brillelli.

Good Luck!