I am still having trouble posting in the classifieds so I am posting it here
My 72 parts book shows this is a Jetfire only fuel pump. GM part number 5621812 and AC part number 6486. The Jetfire fuel pump had higher pressure and the system had a return line back to the tank. This way there was more fuel available if needed. This is new NOS and not rebuilt and not the newer style crimp (non rebuildable) pump. I don’t need to sell it but if someone could use it I would rather let it go than to have it just sit in my parts stash. $135 and shipping.