That fuel shutoff can really pinch you. It's air actuated and won't work until you have around 90 lbs of air in it so if you happen to start your bus and then decide to shut it off right away it won't stop until you have the air pressure to actuate it. I found that out the hard way one day.
"That's all I have to say about that"... (Forrest Gump)
Mohawk sells rebuild kits.
Well that function is working because I did the same thing the other day. I fired her up and tried to shut it down a minute or two later. Turn the key off and nothing. Your right about the around 90 pounds part. It would not shut off.