This looks very tempting.

http://www.vansairforce.com/community/showthread.php?t=1062

But can anyone explain the physics of it?

RV vent lines run from the upper tip of the tanks (next to filler hole) and then normally into cockpit, up cockpit wall, loops down to floor and into 90 degree fitting down through floor and pointing forward.

(http://www.vansairforce.com/community/showthread.php?t=1062&page=4)

There is a mention of RV-10 vent lines, that gives the idea they just come out of the tanks and down and out, but no pictures.

Finn

(Still figuring on where to put vent, transfer and return fittings in right tank)