02 F250 PStroke shut down problem???

friends 2002 F250 diesel shut down driving down the highway, caused accidents, bad deal. he cycled the key and it restarted. has happened a couple more times. - anyone with experience/answers???
thanks

7.3 check oil pressure regulator and wires to it. it just in front of the fuel filter housing in the back of the oil pump . not the oil pump for the engine this oil pump makes the pressure needed to fire the injectors. The ignition cuts power to the regulator turning the engine off.

thanks for that info, we will try it1