SOB...

[Brianedwardss]

I assume you've tried unplugging the wire on the FSV... If it's unplugged and still stays running, then it gummed up/seized. Mine did the "staying on" thing for a week. Turns out my battery grounds on the front of the motor were dirty and the key wouldn't turn the engine off, I had to unplug the FSV to shut it down.

 

[1dieselman]

Yes I've tried unplugging the power from the FSV. I usually run diesel clean in the fuel but maybe I will fill the fuel filter with it and see if that helps.