Fuel Injectors

There are two basic types of fuel injectors. You may find any one of these injectors in your car:

a. Mechanical Injector

b. Solenoid Operated Injector

a. Mechanical Injector: Practically, this type of injector is used in a continuous fuel injection system. This injector contains a mechanical needle valve, and the pressure of fuel operates this valve to control the fuel injection. The pressure of fuel intends to open and close the needle valve rapidly. When your engine is in the running condition, this rapid movement aids to atomize the fuel for proper mixing with the air. When your engine is off, a spring provided with the injector forces the valve to remain closed.

b. Solenoid Operated Injector: This is a widely used injector in the automobile industry. The ECM of your car directly controls this injector. If you start your car’s engine, the injector will get a voltage signal. Then, the solenoid of this injector will be energized. After that, the injector will be opened to spray out the fuel into the cylinder. Practically, you will find this type of fuel injector in the following fuel systems: i. Throttle Body Injection System ii. Pulsed Port Injection System.