First Show with My Restored Car!

Swinger 340 said

So it's the inner cap that seals at the fuel neck and not the outer cap? Maybe sense the fuel door was cut out of a car, you could also get the fuel tube and cut of the top and braze it into the original fuel tube. That way the fuel door will seat without the inner cap.

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The outer door doesn't seal; you still need a gas cap on the inside. The challenger’s factory fuel neck is plastic so welding isn’t an option. If you put the door exactly where the old one was your original fuel neck will literally slide right in through a rubber grommet and into your tank. SUPER EASY!