Need help with a Standyne Roosa Master Injection Pump

[Morphious]

I have an old JD Industrial tractor that ran great all summer bailing hay with it. Went to use it back in sept-oct sometime and started it, walked away to let it warm up, and it died. Didn't have time to really mess with it then, figured it was the fuel filters. Well, went out today with some free time and changed the filters, bled the lines to get the air out of the system, and bam, same thing. Ran for a few minutes and then shut down. I have narrowed the problem down to the injection pump. After fiddling with it for an hour or so, I broke loose the return line from the injectors to make sure there was no air in them, and started the tractor, it ran fine, when fuel started coming out of the return line, I replaced the line and tightened it down, the tractor died. Repeated the process, tractor ran as long as the line was loose and spewing fuel, as soon as I tightened the line up the tractor would die. I think what is happening is the pressure is building up on the return line. I think that the bypass valve is plugged up. What I need to know is what I need to do to unplug/fix this problem. Any help on this would be greatly appreciated.



Morph.

 

[DennyDay]

Fuel Pump

Sounds like you've identified the problem. Sounds like sitting may have caused the problem. remove check valve and free up with compressed air. Also check fuel return line, this may be kinked or have crud or a nested insect blocking it

Denny