ORIGINAL: wws2010
no i am saying tht you route the engine in the center hole and the two fuel lines on the outer two, that would work right? The reason that i want such long flight times is that it will be a kind of uav for my senior project at school. And i really want to wow the teacher.
Nope it won't work. Not shown in those diagrams are the exhaust holes for the air on the side not being pressurized. The 3ways for the autococker paintball guns are more accurately called 4 way switches. There's the feed line (not counted) the two output barbs as shown in your diagram but there's also two small exhaust holes that are not shown. In the diagram when one side is being pressurized the other side connects the exhaust hole to the non pressureized line so the air can be let out as the ram travels.
It would require a modified or new outer body for the valve that only has the three barbs and avoids the exhuast holes.
I got into paintball myself last year. I've got 4 autococker style markers so I'm sure this is the case.
The best way to go for a long motor run would still be a main tank centered under the wing at the CG location and a small float bowl tank. Another option would be that fuel regulator that may work for this style of installation. However I'm not that familiar with the regulator but I know that a float tank can be made reasonably easy.