I have to agree with davham. Inverting anthing bigger than about a 25% airplane is a problem. It would take 2 guys to accomplish this with a 35%, and you would find a field full of laughter if you attempted this with a 40%. Keep it simple--2 lines with a T. No problems, very simple, easy to maintain.

As for the felt clunk in the tank. I have heard of people having good results with this, but I have also heard of people having problems. I have one of these clunks in my 2 gallon jug that I fuel the plane with, but I just have a standard clunk in the tank. That way, the fuel gets filtered as it enters the tank. Either way, DO BE SURE to use a filter--felt instead of the glow-type screens. Gasoline will have some small "crap" in it. And it will gum up your carb in a hurry.

Ken