My 77 hasn't ran in a few years so along with everything else I'm replacing I've also decided to replace the fuel pump. I happen to have a perfect spare tank from a parts truck that I'm going to swap in. My current tank has a huge dent, and instead of repairing that I figured this would be easier. I swapped the fuel pump and before I reinstalled it back into the tank I noticed this threaded portion. Is there something missing from the fuel pump assembly that was in this tank?