If your vent is in the top of your fuel tank, and the vent fitting is on top of your plane, then won't you lose fuel while flying inverted?
Normally you would put the vent out the bottom of the plane opposite the direction of the tank vent. Or does the fact that air is constantly flowing into the tank prevent that from happening?
Good Idea for installing tight tubing on those pesky fittings. I tried to get that 4mm stuff that jetcat gives you to fit on those solinoid valves. I had to put lubrication on the fittings, and then heat the tubing to put it on. Only works sometimes.

Dan