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How to Replace Diesel Injectors

Updated February 21, 2017

The injectors in your diesel engine deliver the fuel to the cylinders from the fuel pump. Your diesel engine will have the same amount of injectors as cylinders. Aftermarket companies manufacture replacement injectors for almost any diesel engine. Injectors are also available to increase the amount of fuel supplied to your diesel engine. These can be purchased online or at any auto parts store. Installation can be done yourself, using simple tools.

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  1. Open the bonnet of the vehicle by pulling the release lever from inside.

  2. Locate the valve cover on the engine. The valve cover is usually on top of the engine. The fuel lines for each injector connect to the engine block directly under the valve cover. Remove the bolts with a ratchet and socket. Remove the cover to access the injectors.

  3. Locate the fuel supply lines. They enter into each injector. They are usually gold in colour and connect to the engine block directly under the valve cover. Remove the fuel supply line nut with a wrench.

  4. Remove the bolts that secure the injector hold-down in position with a ratchet and socket. Remove the injector hold-down bracket from the engine.

  5. Grasp the injector with pliers and remove it from the engine.

  6. Place the new injector into the engine. Place the injector hold-down bracket onto the injector. Align the notch at the top of the injector with the notch in the injector hold-down bracket and install the bolts. Tighten them, using a ratchet and socket.

  7. Replace each injector one at a time to avoid confusion until each injector has been replaced.

  8. Reinstall the nuts that secure the fuel supply lines to the engine block. Tighten the nuts with a wrench.

  9. Reinstall the valve cover onto the engine. Align the holes and install the bolts. Tighten them, using a ratchet and socket.

  10. Start the engine and check for leaks.

  11. Tip

    Crank the engine to allow the fuel to pressurise the lines after the injectors have been replaced.

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Things You'll Need

  • Ratchet
  • Socket set
  • Wrench set

About the Author

Living in Utah, Jared Curtis graduated in 2005 with a Bachelor of Science degree from Utah Valley University in Orem, Utah. Curtis is continuing his education in hard sciences to apply to medical school in the future. He began writing professionally in 2010, specializing in cabinet-related articles.

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