Older style fuel GM fuel injector.
Newer style GM fuel injector.
Fuel inlet from fuel rail
Electrical connector
Fuel spray tip
Fuel injectors.
Style will vary depending on engine size and model year
The fuel injector is a solenoid operated device, controlled by the PCM, that meters
pressurized fuel to a single engine cylinder. The PCM energizes the high-impedance (12.0
ohms) injector solenoid to open a normally closed ball valve. This allows fuel to flow into the
top of the injector, past the ball valve, and through a director plate at the injector outlet. The
director plate has four machined holes that control the fuel flow, generating a spray of finely
atomized fuel at the injector tip. Fuel from the injector tip is directed at the intake valve,
causing the intake valve to become further atomized and vaporized before entering the
combustion chamber. An injector stuck partly open can cause a loss of pressure after engine
shutdown. Consequently, long cranking times would be noticed on some engines.

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Fuel Injector Pictures And Operation