Injection Nozzles

The injection nozzles spray fuel into a prechamber on each compression stroke. A fuel return line connects all injectors and returns excess fuel to the pump. If spray patterns are incorrect, nozzles can be overhauled.

Injector opening pressures are adjustable. On I-Mark models, opening pressures can be adjusted by shim replacement. P'UP models use an adjustment screw in the injector nozzle.