Fuel Injector: Description and Operation

PURPOSE
The fuel injector is an electro-mechanical device that both meters and atomizes fuel delivered to the engine where their tips deliver fuel just ahead of the intake valves..

OPERATION
An electrical control signal from the Powertrain Control Module (PCM) activates the injector solenoid allowing fuel to flow.

The fuel injector flow orifice is fixed and the fuel pressure drop across the injector tip is constant, fuel flow to the engine is regulated by how long the solenoid is energized (pulse width).

Atomization is obtained at the end cap.

CONSTRUCTION
The fuel injector bodies consist of a solenoid, needle valve assembly, and an end cap.