RE: Cowl fueling
I use DuBro Kwik fills in all my planes and have never had a failure yet. Plus you don't have to mess with anything when removing the cowling. Just drill a hole in the side of the cowling and use a piece of 90 degree bent aluminum stock attached to the firewall and put the fill right next to the side of the cowl and you can just plug into it and fill her up. These kwik fills also stop fuel from going to the carburetor when plugged in for fueling. No hydro lock anymore. This is only my opinion.
Gibbs