RE: Film Can Fuel Tank
I took a slightly different approach and used a continuous piece of tubing. On the pickup tube, I worked a short piece of brass tubing along the inside of the tubing, sort of like a shunt used in arteries, to the point where it passes thru the can. The short piece of brass keeps the tubing from collapsing and ensures a tight seal. You can see the slight bulge indicated by the bamboo skewer.
The tubing is the silicone insulation from a piece of 12 ga. noodle wire - the very flexible wire used by the car boys and on many lipos. The insulation is impervious to fuel and extremely flexible allowing the clunk to move freely. The clunk in the picture is a standard Sullivan clunk with the barb cut away and a short piece of tubing sweated into the hole. The barb is too large for most of out tubing sizes, but the tubing insert is just about ideal.
I got the idea of having no joints in the fuel tubing from CombatPigg, so just adapted it to a Fuji tank.
andrew