Possibly it is a tank vent or used to scour the VOS from the tank. Epoxy itI just rescued a newer Briggs that was headed for scrap due to a carb issue. When I tipped the mower to change the oil, some gas escaped from the top of the tank where a little fitting?? has been snapped off. I've seen this type of tank before but never with the little fitting. It goes into the air cleaner housing.
I'm not crazy about spending $50 on a new tank for an unknown mower. So other options or advice would be appreciated.
Model is 103MO2 and I've attached a pic of the tank and circled the fitting
Sealing that hole and buying a vented cap would be ideal. My problem is finding a vented cap that fits this tank. I'd hate to buy a new cap only to find its sealed also. If anyone needs to know, the cap I have currently is 594061 which has been superseded to 84004416Plug it and drill a tiny hole in the gas cap if you don't want to spend the money on a vented cap.