Fuel Injector: Description and Operation

Throttle Body Injection Unit:

Fuel Injector Parts:

The fuel injectors are solenoid activated, controlled by the control module. The control module turns on the solenoids, which lifts a normally closed ball off a seat. Fuel, under pressure, is injected in a conical spray pattern at the walls of the throttle body bore above the throttle valve.
The fuel that is not used by the injectors passes through the pressure regulator before being returned to the fuel tank.