Fuel Injector: Description and Operation

Fig.2 Fuel Injector Location (Typical):

The fuel injectors are positioned in the intake manifold with the nozzle ends directly above the intake valve port (Fig. 2).

Fig.3 Fuel Injector:

The fuel injectors are electrical solenoids (Fig. 3). The injector contains a pintle that closes off an orifice at the nozzle end. When electric current is supplied to the injector, the armature and needle move a short distance against a spring, allowing fuel to flow out the orifice. Because the fuel is under high pressure, a fine spray is developed in the shape of a hollow cone. The spraying action atomizes the fuel, adding it to the air entering the combustion chamber. Fuel injectors are not interchangeable between engines.