Modern diesels have an electrical device as part of the mechanical injector pump. IIRC it requires current to allow the motor to run (interrupt the current they shut down) On older (before computers) diesels it was common to have a large butterfly valve to close the intake (air) for manual shutdown. Putting valves on the high pressure side of the injector pump would be *real* bad, the pump is a positive displacement type mechanically geared to the motor, the pressure will rise until something breaks. A valve before the injector pump would be a bad idea. The fuel is used as a lubricant in the pump, running it dry would not tend enhance it's lifespan. Plus you'd have to prime the injector pump again every time (a notoriously difficult process) In modern computer controlled diesels I think interrupting the fuel would cause a fault condition, but that might only be a matter of a check engine light. I don't believe interrupting the electric line to the injector pump would cause a problem, that's how the key controls the motor anyway. Would this be an automotive engine or something else (pump, generator, etc)? -Denny > Hi all > > Does anyone know the normal method used to cut-out a diesel engine. > If mechanical only, I presume a valve needs to be retrofitted on the high > pressure side, > and if modern electric, is it OK to just interrupt the solenoid power, or > will this cause the enginer management to go wonky? > > Regards > Roland Jollivet > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.