Model Tech P-47 Thunderbolt Instructions For Final Assembly page 39

Double-check the seal between the stopper and the fuel tank. To do this, carefully try to twist the stopper assembly.
If the stopper twists in the fuel tank, tighten the machine tighter. If the stopper doesn't twist, the seal is good.
With the stopper assembly in place, double-check to make sure the clunk can move freely inside the fuel tank.
Ideally, the clunk should be about 1/4" - 3/8" in front of the back of the tank.
Keeping the clunk from touching the back of the fuel tank will prevent it from getting stuck during flight.
Step 3: Installing the Fuel Tank Assembly
Cut two pieces of silicon fuel tubing to a length of 8".
Install the two pieces of tubing to the aluminum tubes at the front of the tank.
For your convenience, we suggest marking the ends of the tubing "vent" and "fuel pick-up" so you don't confuse them
when it comes time to connect them to the engine later on.
Feed the ends of the fuel tubing through the predrilled hole in the firewall and slide the fuel tank into position, making
sure that the stopper assembly engages the predrilled hole in the firewall. When aligned properly, the fuel tank should be
pushed forward as far as possible and the back of the fuel tank should rest in the tank-support bulkhead.
IMPORTANT
Make sure that the molded bubble in the top of the fuel tank is toward the top of the fuselage.
IMPORTANT
The throttle pushrod wire should be able to move freely between the side of the fuel tank and the edge of the tank-support
bulkhead. If you want you can also put a bend in the pushrod wire to allow it to pass over the top of the support bulkhead.
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Cut and install several large pieces of foam rubber to
hold the fuel tank firmly in place. Wedging the pieces of
foam between the top and bottom of the fuel tank and the
fuselage should be sufficient.
Make sure the pieces of foam do not interfere with the
throttle pushrod wire.
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