Fuel injection shutdown system

A fuel injection shutdown system for a fuel injected internal combustion engine having a plurality of cylinders and a mechanical fuel injector with a injector return spring for each cylinder cooperatively associated with a fuel injection cam disposed on a camshaft and lifter bodies that are reciprocated in lifter guides to inject fuel into each cylinder upon each revolution of the camshaft, the fuel injection shutdown system comprising a slot disposed in each lifter guide and a slot disposed in each lifter body, a hydraulic cartridge disposed to fit into the slot in the lifter guide and be fastened thereto and to extend into the slot in the lifter body, the slot in the lifter body being longer than the slot in the lifter guide and so disposed as to allow the lifter body to be reciprocated by the fuel injection cam without the cartridge contacting the bottom or top of the slot in the lifter body, the hydraulic cartridge having a stop pin slidably disposed therein and a fluid passage which when supplied with pressurized hydraulic fluid causes the stop pin to extend from the cartridge and contact the top of the slot in the lifter body and hold the lifter body off the fuel injection cam, whereby fuel injected into the engine will be discontinued within two engine revolutions and the engine will shutdown.