I have a 1981 kubota l175 and it isnt starting, here is what ive done. I primed the injector pump with the air relief on the filter houseing and the relief on the injector pump, i removed the fuel lines to the 2 injectors and there is no fuel coming out of the top of the injector pump. If i loosen the two noozles i guess they are atop the injector pump fuel flows but doesnt really pump, if i hook the lines back up fuel will never make it out the other end of the lines so im pretty sure it isnt pumping fuel. The kubota website doesnt sell a pump because they say they are indestructable... what can i do or check to get this thing going. There is also no black smoke coming from the exhaust while cranking thats what led me to a fuel problem. Thanks in advance