I've narrowed down the problem. So, I thought I'd start a new one with a nifty diagram attached that I made in some new cutting-edge program called "Paint."

So, here's the deal: My shutoff valve on the injector pump works fine. Either the part of the ignition assembly that engages the ignition shutoff valve is faulty or the ignition shutoff valve itself is bad. The shutoff valve is pictured in my diagram in with the ignition in the engine running and engine off positions. This is is a small piece--about an inch-and-a-half long, that attaches to the side of the ignition assembly with the button going into a hole in the assembly. It has two vacuum lines attached to the smokestack-looking things (is that the technical term?)--one that gets vacuum and one going to the other shutoff valve in the engine compartment.

I've attached a diagram that shows how the valve is operating--it seems to me like it's not working correctly, but I'm not sure. There are 3 openings (blue on the diagram). When the ignition is turned to the running position (ON), the button on the end of the valve (black arrow) is not pressed in by the mechanism in the ignition housing, valve "3" is closed, and valves 1 and 2 are open--this allows vacuum to enter through valve 2 and continue through valve 1 to shut off the engine via the injection pump shutoff. I can reverse the vacuum lines and it will operate the same way--this does not make sense because dieselgiant says that the shutoff will not function correctly if the two vacuum lines are mixed up--in my case, it makes no difference.

When the ignition is turned OFF, the button is pressed in by the ignition mechanism and the vacuum coming in through valve "2" is cut off, allowing the engine to run.

I don't know what function valve "3" has.

Can anyone tell me if this valve is functioning correctly? I hope it's not--it's $25 to replace and a new ignition housing is quite a bit more. Right now I've got the valve dangling under the dash with a rubber band wrapped around it and pressing a piece of wood into the valve button.

Jeez...sorry that was so long-winded.

Thanks in advance...Attachment 42924