To make it even more confusing: that little white thing is a valve

I got my gas tank from Jersey Modeler [link=http://www.jerseymodeler.com/id26.html]2.5RHP-R + TRAY Combo.![/link] which already has a filter.

First picture shows the carb vent, medium Tygon fuel line that goes to the little tank/film container. The film container's lit is glued with CA, hole a bit larger than the tubing.

Second picture has a better view on the fuel setup. I have one fuel line to fill/drain the tank and the other with the t-joint is the return overflow line and tank vent, the valve to keep fuel from getting to the engine box. This setup allows clean filling of the plane w/o spilling fuel, a fuel line outside the cowling etc.

Tank inner setup:
One line to the engine with clunk and a piece of brass tubing to keep the line from snapping forward.
Second line with a small piece of fuel line, rest brass tubing bent so it 'lies' on the bottom for fill/drain.
Third vent and overflow, little piece brass tubing bent to the top of the tank.

Use fuel barbs all around, CA and tie all connections in the tank, tie connections outside the tank only.

Hope this is clear [8D]

thit $^@(*$@ site sometimes doesn't allow uploading images.

http://tweakshop.net/DL50-install/11.jpg
http://tweakshop.net/DL50-install/9.jpg