Re: diesel stop solenoid
Faster's advice is a good place to start.
The only thing that I would add is that if the cost really bugs you and it is not repairable, you could put in a manual pull cable. I have done this on two different engines and it only takes a $20 pto cable and a homemade bracket and you have a manual shutdown. The hardest part is isolating it properly so that it isn't really noisy. This option is definitely not for everyone and I am not familiar with your specific engine so it might not fit anyways.