"If you have an M type Fuel Injection Pump I would leave the Delivery Valves alone because pulling up on the Delivey Valve outer Body can pull the Element Barrel up and out of the alighment slot.
On the MW Fuel Injection Pump do not loosen the 13mm Nuts on each sied of the individual Elements."

I have a 5 cylinder. I am not sure but I do believe I have MW IP with the 13 mm nuts on each side 0f the elements. It sounds like you don’t recommend removing the valves whether I have a M or MW type of system.

When I hand pump fuel does come out the over flow. The fuel was dirty coming out even with clean fuel going in and new filters. No fuel comes out of the valves when I hand pump even if I plug the overflow hoses. If I crank the engine a small amount of fuel comes outs out of just two valves.
With just two valves allowing fuel to pass, only these two are getting a bath of the diesel purge solution.