Answer: Go to http://www.ntsb.gov and search homebuilt accidents and
see how many are related to fuel issues. I have been on several
accidents with fuel problems. Having 1/4 ID can be a problem because
of flow and not pressure. Flow is what a engine requires and haveing
5/16 or 3/8 is a better option. The same goes for the vent lines. The
more bends and connections causes flow reductions and having hight
pressue will not solve this problem.

Stache

Thanks,
I was considering 3/8" anyway but I thought it would be a good idea
to ask. Also, I was going to go with aluminum. It's lightweight,
flexable, and should be easy to get the connections.
Lou