Fuel injector parts and functions explained

Dec 05,2025 ID: 46 Views:

Parts of a Fuel Injector and Their Functions:

1. Injector Nozzle

• Function: Sprays fuel into the combustion chamber in a fine mist for better mixing with air.

2. Injector Body

• Function: Houses all internal components and connects the injector to the fuel rail and cylinder head.

3. Solenoid Coil

• Function: Acts as an electromagnetic switch that controls the opening and closing of the injector needle.

4. Plunger or Needle Valve

• Function: Opens to allow fuel spray when the solenoid is energized; closes to stop fuel flow.

5. Spring

• Function: Keeps the needle valve closed when the solenoid is not activated.

6. Fuel Inlet

• Function: Entry point where pressurized fuel enters the injector from the fuel rail.

7. O-Rings/Seals

• Function: Prevent fuel leaks and ensure proper sealing between injector and engine components.

8. Filter Basket

• Function: Traps dirt and debris from fuel to protect the injector’s precision parts.

Purpose of the Fuel Injector:

The fuel injector ensures precise fuel delivery at the right time, pressure, and spray pattern—essential for efficient combustion and engine performance.

PREV: Why DPF is recommended NEXT: Four Major Diesel Injector Faults and Solutions

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