51 8ba fuel pump woes

[Steve51]

The fuel pump started leaking at the diaphragm and after removing it I noticed the mating surfaces were not ideal. O took 220 and 400 grit sandpaper on a flat surface and much improved the surface to the point I can hold up the pump haves together metal to metal and see no slivers of light between them. No leaks now but it won't pump. The diaphragm while not new is not cracked and does not leak into the lower chamber...it does have an extra set of holes due to the offset alignment of the connecting rod. There seems to be plenty of up/down movement of the diaphragm and the engine was rebuilt under my father's ownership several years ago so a worn pump pushrod is not a main suspect. The small outlet valves passes air in both direction so I would say that is bad. The inlet valves only passes one direction.

Would a bad valve cause a total failure of the pump?

The pump on the car is stamped made in Canada. A friend gave me a pump stamped made in USA. The Canadian pump on the right has the six threaded holes symmetrical with the centerline of the pump and has a smaller glass bowl. Looking closely you can see the USA pump on the left the holes are offset from centerline. The pump lever is also different with the USA pump having a bronze bushing...they are the same otherwise. The diaphragm spring also came with a rubber seal on the USA pump and the diaphragm is a heavier rubber material and not cracked but is harder to work the pump by hand. All the parts mix and match even with the offset holes but still no joy. Yes, gas in the tank, the line is clear as I can blow through and make bubbles in the tank. I do have a rebuild kit on the way.

What is a good way to remove these two small valves?They are the pressed in ones.

The two pumps also have different size in and out threaded ports. So what do I have here....pumps of different years, a truck or Mercury pump?