We are having trouble with our Case '73 450B dozer. This dozer sat for 15 years or better and we've gone through various parts of it to get it back in operation. Head gasket, various fluid leaks, general maintenance including the fuel system etc. We've used it several days but now for two days in a row, it will run for several hours with no problems and then die. It will restart with no problem and run for 5-20 seconds and die again.
We have good natural flow from the fuel tank through both filters all the way to the injector pump. We've blown air back into the tank on both the supply and return fuel lines and they seem to be clear and we've changed the filters two times now. I read on another post here to loosen the timing cover plate and when we do that and allow a decent amount of fuel to leak, it runs and works ok. There's another plug on the side of the pump that we can loosen and it does the same thing and runs. While it's running we took the return line lose and there's nothing coming from the injectors and it's only trickling out of the injector pump.
We've loosened each injector line at the pump to check for air but they appear to be spraying fuel only.
Is it possible that there's an air-lock still in the pump and or injector lines, or does this sound like something within the pump itself?
Thanks for any help,
Mark
We have good natural flow from the fuel tank through both filters all the way to the injector pump. We've blown air back into the tank on both the supply and return fuel lines and they seem to be clear and we've changed the filters two times now. I read on another post here to loosen the timing cover plate and when we do that and allow a decent amount of fuel to leak, it runs and works ok. There's another plug on the side of the pump that we can loosen and it does the same thing and runs. While it's running we took the return line lose and there's nothing coming from the injectors and it's only trickling out of the injector pump.
We've loosened each injector line at the pump to check for air but they appear to be spraying fuel only.
Is it possible that there's an air-lock still in the pump and or injector lines, or does this sound like something within the pump itself?
Thanks for any help,
Mark