Don't pinch the fuel line that will just cavitate the injection pump and cause issues you need to pull the wire off the pump that controls the fuel solenoid. Have you taken the ip apart? Sometimes if the housing is installed wrong it will stay running.
FSS = Fuel Shutoff Solenoid, it's an electrically-actuated valve that when applied power to opens the injection pump's inlet port and allows fuel to flow in the IP. When you shut your truck off you essentially cut power to the FSS, which causes it to snap closed and kill fuel flow into the the IP - enigine runs out of fuel and stops.
Thank you lcam, and the fss is located in the ip right? My starter switch on the column busted in half mid drive and that was what caused my truck to keep going. So hopefully the fss is not an issue on my truck yet.
Yes indeed, the FSS lives inside the IP, under the top cover. Those switches are a know problem by the way, I've seen quite a few of them halfway split on customers vehicles - and there was a TSB on those to boot, cause they like overheating and causing fires when they get loose like that.