All our large diesels had an air cut off valve. None of them would run without air.
All our large diesels had an air cut off valve. None of them would run without air.
The shut off solenoid in my 12V stuck a couple of years ago... It was definitely an interesting experience, but fortunately not truely a runaway situation:
Turn the key off; engine still running. 
Remove key; engine still running.
Put it in 4th gear and popped the clutch; engine stopped. (whew) 
I had a 79 300D for a short time that didn't always turn off with the key. Mercedes cleverly placed a lever in the engine compartment that would cut the air supply and kill the motor. Even if that wasn't there, I don't think the 88 hp that car had (when new) would've been too hard to deal with...
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