Each cylinder has an identical fuel injection nozzle mounted in the pre-combustion chamber. As the pressure wave of injection reaches a nozzle, the needle valve is lifted against spring force, allowing the fuel to exit into the pre-combustion chamber of the cylinder as a highly atomized spray. A small amount of fuel travels between the needle valve and pintle nozzle, providing a lubrication. The two passages inside of the upper half of the nozzle body allows fuel which has lubricated the needle valve in order to exit into the fuel return system.