Thanks
Sport Pilot. I am going to leave the nipple open then. While it is inside the cowl, I don't notice much spewing oil on in there, so it's fine as is. Yes, to answer your question, I do have a vent line to the tank. It's my overflow line, and it comes out the bottom of the cowl. Looks like I just need to make some tuning adjustments then, to get her to run better. I'm leery of fooling...