It'll run without the shut off solenoid. Just won't shutoff unless you manually pull the fuel lever down or stall it by covering the air intake at the turbo. Mine wore and got stuck. It would start but then had no power. Remove it and see what happens, couple of bolts. I know also that there is a check valve in the return side of the pump that can hang up and cause problems. It is replaceable on the vehicle.
Doug