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Hi my name is Robert...
What engine do you have? IF it is a cummins I would look on the passenger side of the engine up high for the fuel cut off solenoid, it will have a plunger on it with a rubber boot, when you turn the key to start the plunger will move, and when you crank over the plunger stays in place, when you shut the ignition off the plunger should move again, you should be able to manually move the plunger and see if the engine will shut off, if so then I suspect that solenoid is at fault. If you still need more help please let me know.... Robert