Just happened to think, there is something I can add to help you guys. www.aircraftspruce.com Their 1/8" "primer" line works great for our fuel lines. It is a bit too stiff for a clunk line inside a tank, but it is bulletproof and long lasting for all other gas engine plumbing, and is cheap to buy. They also sell the aluminum bar stock that I use for making prop hubs for a LOT less than McMaster Carr.

Hope that helps someone,
AV8TOR