the fuel heater is woring? i am lost idk whats going on maybe somewere there is a air leak? possibly?

 

i think what they are saying is you have an air leak in your fuel heater. they are prone to leaks.

 

removed pre heater. can still pump primer all day long get some air out of screw on top of filter but still can pump primer and it never gets tight. I hear some air noise around top of injection pump when i first start pumping but it goes away.

 

I wonder if something messed up in the lift pump. The pump does the "pumping" after the cam lobe break over and it is back on the base circle, the pump pushes back out against the base circle with a strong spring which is what does the pumping so something could have happened to it. The manual primer uses a different mechanism of pumping as far as I know so it might work while the cam driven part doesn't. You could take the banjo bolt out of the line going to the fuel filter from the lift pump and crank the engine over with the starter and see if it's pumping fuel out in little spurts from the banjo fitting. If it is, hook it back up and go farther down the line like the banjo on the other side of the fuel filter. Same spurting then you are good there so take the banjo bolt out of the overflow and see what happens there. If it is always spurting about the same amount then I would say the overflow would be the next culprit. I take it you took the cam out as well? Did you take the lift pump off or leave it in? That plunger on the lift pump pulls right out and could have just fallen off or maybe even got bent so it is stuck if it hit the side of the cam lobe or who knows what. Doing the previous stuff would make this obvious if it wasn't spurting.