Fuel Injector: Description and Operation

Injector Locations:

Injector:

The injectors are solenoid operated valves, installed in the intake manifold. When the solenoid coil is energized, the plunger is attracted. The needle valve that is attached to the plunger is therefore pulled to the full open position and fuel is injected through the valve. When the solenoid is de-energized spring pressure closes the valve. Since the injection nozzle opening is a fixed size and the fuel pressure is also fixed, the injection amount is determined by the duration which the needle valve is open.