New Carter Fuel Pumps?

pumps work off vacuum: the plunger gets moved (down) and sucks fuel in through the 1 or 2 inlet check valves.
the lever cycles the other way and the 1 or 2 inlet check valves close and the outlet check valve opens and the lever pushes out the fuel to the carb. If you can open the pump (round style with a bunch of bolts) you can sometimes reseat the popped out check valves and make the pump worlk like new again. the crimped style is a goner.