Hangar 9 P-40 Warhawk Assembly Manual page 32

Section 11: 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. 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 the clunk will fall to the lowest point
(all directions except for having the stopper facing down).
Note: The fuel tank is taller than it is wide.
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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.

Step 9
Mark the vent tube on the fuel tank. This will be helpful
after the tank has been mounted in the fuselage.
Note: When installing the fuel tank, make
sure to have a piece of foam at any point
that contacts any structure inside the
fuselage. Without the foam, vibrations will be
transmitted to the fuel tank, which could cause
the fuel to foam. In turn, you will not get the
optimum performance from your engine.