Sam,

I run three lines from the tank. Two lines have clunks, one is plumbed directly to the carb, and the other goes to the fuel dot. That way I can de-fuel my plane without standing it on it's nose. I've done this on all my planes and it has always worked well.

I use these:

http://www.bissonmufflers.com/en/acc...ting_id=114125

They cost about $7.00 each.

I install this by drilling a hole in the cowl, use a small peice of lite ply inside the cowl to beef it up a bit, and leave your "fill" line long enough so that you can thread it through the fuel dot easily while installing the cowl.