I'm converting my OBS to a superduty electric fuel pump. My new Airtex fuel pump came with the "in" side fitting removed. It came with two copper washers, an O-ring, and a threaded brass fitting that fits on the (plastic?) pump end. What parts go between the pump and the fitting? What are the other parts for?

 

Use the copper crush washer and the brass fitting. Screw the fitting into the pump with the copper washer behind it.