Ford L8000 Diesel Help

[AUTOHANDLER36]

Hi, I Have A 1987 Ford L8000 Diesel And When I Shut The Key Off The Engine Stays Running I Have Replaced The Ignition Switch And The Fuel Cutoff Solenoid But It Still Does The Same Thing Any Help Would Be Appreciated Thank You

[ModMech]

What engine? You could have anything from a Brazilian Ford, to a Big bore Cummins or Cat in that truck.

[fordman1981]

you could have a blown fuse or a frayed wire somewhere between the solenoid and the ign switch , or posibly your fuel injector pump could be leaking fuel past the shutoff valve what kind of injector pump do you have if its a older robert bosch with the solenoid having a external linkage to the pump your valve could be leaking