Model Tech P-47 Thunderbolt Instructions For Final Assembly page 38

Step 2: Installing the Stopper Assembly
Carefully push the stopper assembly into the fuel tank.
Gently rotate the stopper assembly until the aluminum vent tube rests inside the molded bubble in the top of the tank.
If you have trouble seeing the vent tube, hold the fuel tank assembly up to a bright light. The light will illuminate the
inside of the tank making it easy to see the vent tube.
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Slide the 20mm diameter front-plate over the ends of the
aluminum tubes and push it against the front of the stopper.
Push the 3mm x 20mm machine screw into the front-
plate and through the stopper assembly, then partially thread
it into the back-plate.
Attach the clunk to one end of the silicon fuel tubing.
Attach the fuel tubing onto the end of the aluminum
fuel pick-up tube (straight tube).
While holding the fuel pick-up tube in place, adjust the
length of the silicon fuel tubing until the clunk is 4" back
from the rear of the stopper assembly.
When you're satisfied with the alignment of the stopper
assembly, tighten the machine screw until the rubber stopper
expands and seals the fuel tank opening.
WARNING
Do not overtighten the machine screw or the front of the fuel
tank may split.