Fuel Injector: Description and Operation

Fuel Injector:

PURPOSE
Allow fuel to be injected into the intake manifold.

LOCATION
Mounted on the fuel rail.

OPERATION and CONSTRUCTION
The fuel injectors are small electrical solenoids. The injectors receive the ground circuit from the ECU in terms of "Injection Duration". The voltage applied to the electrical windings pulls the needle valve up allowing fuel to flow through the nozzle.

WARNING: The positive circuit is always "Hot" at the injector terminals when the battery is connected.