I've got a JD 4475 that will not stay running. It's got all new filters. When I turn it on when it's cold it will run 10-30 minutes. After that it's like someone just turned the key off. It will instantly restart when I key cycle it and run another minute or so and turn off again. From what I've read it may be the fuel shut off solenoid or wiring to it? If so how would I go about testing tests and where are they located. Next to the injection pump? It's not showing any warning lights when it shuts off.