Watched your vid. The fuel pump shouldn't have air coming in. You have a small air leak between the tank and the pump. It probably isn't big enough to affect driveability yet. It may be pumping air into the fuel filter at the carburetor. That bowl should have more fuel in it (not full, just more. Maybe 2/3 full).
I will give this recommendation. Lose the Teflon tape at the fuel pump. The flare fitting absolutely does not call for it, and clean NPT fittings don't need it either. If correcting that issue does not stop the air leak, check your fittings between the tank sending unit and the line going to the pump.
I repetitively tighten and loosen the flared fittings and observe how the wrench gradually moves a little further around each time it is tightened. Once it doesn't progress any further around, you are done.
Doing it this way avoids messing up the threads and the hex on the fitting from too much torque being applied.
What's going while doing it this way, is that, as you are tightening, you are forming the flare to the angle of the inverted flare seat. Doing it progressively (tightening/loosening several times) prevents you from galling the threads.
Carl
