Fuel Injectors: Notes

The Fuel Injectors are electronically controlled solenoid valves that provide precise metered and atomized fuel into the engine intake ports.

Fuel is supplied from the fuel rail to the injector body. The fuel is channeled through the injector body to the needle valve and seat at the tip of the injector. Without electrical current, the needle valve is sprung closed against the seat.

The Fuel Injectors receive voltage from the Main Relay. The EWS2000 activates ground, via a transistor, that allows current flow through the injector solenoid creating a magnetic field that pulls the needle "up" off of its seat. The pressurized fuel flows through the tip of the injector that is fitted with a directional angle "plate" with dual outlets. This "fans out" the spray into an angled patterns which helps to atomize the fuel.

When the EMS2000 turns off the transistor that supplies ground, the needle valve is sprung closed against the seat and fuel flow through the injector is stopped. The lower portion of the injector body is jacketed in metal.

The length of time that the EMS2000 activates the Fuel Injectors is very brief, the duration is usually represented in milli-seconds (ms). This affects the amount of fuel volume flowing through the Fuel Injectors. The EMS2000 will vary the length of time (ms) to regulate the air/fuel ratio (mixture).