ORIGINAL: bonebreak

I would recommend just adding a third line and using a fuel dot. They are easy to install, and easy to use. I like the way they look also, kinda like a fuel cap. They are really cheap, and any hobby shop will have a few to choose from.

http://www3.towerhobbies.com/cgi-bin...?&I=LXAHE1&P=7

Here are some pictures of the one I use (cost like 3 bucks at the LHS).