Originally Posted by charlottea
Yes, my manual said the same thing. So the only option is to cut off the air-intake (mine's on the front and easy to get at). Use a rag or a board. Never use your hand.
Not that I have any actual experience with a run-away diesel. I think I'd be too frightened to get anywhere near it.
I'm hoping that I never have to deal with it, but its good to have contingency plans!