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Guess that is Major Tom. I mistook your "rank" by seniority for user name. In any case, I did as advised and the new pump did the trick. Thing started right up and purred like a kitten. A wee bit of tappet noise, but it has been sitting for some time... It never occurred to me that the...

Great advice Sergeant! Niether point occured to me. I'll give it a shot.

The problem does not lie with the tank or lines in this case. As stated above, I've run a short flexible line directly from a container of fuel to the inlet on the pump. It has to be the pump or what runs the pump. The pump tests on the bench. Pumps are cheap and I will probably replace it...

I appreciate the input guys. I did run a line from a gas can to the input on the pump while cranking the engine, so I know that it is not the fuel lines or tank. I've never heard of an eccentric being the problem either, but the fact that the pump would move fuel when tested outside of the...

I tested the pump by clamping it in a bench vise, running a length of fuel hose from a small gas can to the inlet on the pump, and rapidly pumped the arm by hand. While obviously insufficient for a pressure and flow test, it did readily move fuel through the pump. Pretty good spray at that...

I just picked up a 75 M800 with a 77 parts truck. There is fuel to the pump. I tested the pump on the bench and it seems fine. Mounted in the engine it does not pump fuel. I assume that the rocker arm on the pump rides against a cam of some sort. When I install it, there is a slight tension...