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The O-rings in the fuel selector switch are notorious for drying out and allowing air to be sucked into the system. That would be my first suspect. I had that problem on my 816 and had to bypass it.

Having had a wrecker with the 250 Cummins in it that ran away I can tell you that it is not a pleasent experience. If motor oil is getting into one of the cylinders from some source it could cause it to do that and put out the smoke. In my case fuel had filled up the crankcase and that...