Hangar 9 Twist 3D .40 Assembly Manual page 24

Section 10: Fuel Tank Assembly
Step 6
Locate the short piece of silicone fuel tubing and the
fuel tank clunk. Install the clunk onto one end of the
silicone tubing. Slide the silicone tubing (end
opposite the clunk) onto the fuel tank pickup tube
(straight tube) in the stopper.
Step 7
Carefully insert the stopper assembly into the fuel
tank. Note the position of the vent tube; it must be
up at the top portion of the fuel tank to function
properly. (Hint: The fuel tank is taller than it is wide.)
Also, it may be necessary to shorten the length of
the fuel pickup tubing to make sure the clunk does
not rub against the back of the fuel tank. You should
be able to turn the tank to any attitude and have the
clunk fall to the lowest point (all directions, except
for having the stopper facing down).
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Step 8
Tighten the M3 x 20 screw carefully—do not over
tighten. This allows the rubber stopper to form a
seal by being slightly compressed, thus sealing the
fuel tank opening.
Important: Be sure to differentiate between
the vent and fuel pickup tube. Once the tank
is mounted inside the fuselage, it will be
difficult to tell the tubes apart.