Injection Nozzles

The injection nozzles spray fuel into a prechamber as each compression stroke occurs. A fuel return line connects all injectors and returns excess fuel to the pump. Injectors are opened by high pressure in the fuel lines and cannot be adjusted. 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.