How to Replace a Fuel Injector

Below guide will teach you How to Replace a Fuel Injector . Please follow the instructions carefully.

Things You’ll Need:

  • Fuel Injector Tester
  • Socket and Ratchet Set
  • Needle Nose Pliers
  • 3/8 in. Drive Ratchet
  • Fuel Injector

Estimated Costs:

  • DIY Costs: Est. $52.65 parts only
  • Shop Costs: Est. $362.52 parts and labor


  • Prop the engine hood up.
  • Find the fuel injector rails.
  • Fit the fuel injector tester onto the Schrader valve located on fuel line.
  • Move the ignition key to ON position. This will let the fuel pump to build pressure in the system.
  • Now you are ready to hit the press button on the fuel injector tester. This will allow the tester to throb the fuel injector for the required number of time.
  • Do the same for each fuel injector and keep recording the readings. In the end, calculate the average reading for all the fuel injectors, i.e. sum up all the readings and divide the results with total number of fuel injectors present in the engine.
  • Next, you need to evaluate the individual readings with the average PSI reading. If any of the fuel injectors show reading above or below 1.5 PSI of the average, then that fuel injector is defective.
  • Now you have found the defective fuel injector. You need to remove it.
  • First, look for the fuel pump relay and discard it. Turn the vehicle on in order to evacuate any fuel present in the lines. This will ease the pressure in the fuel lines and you can take the fuel injector out securely.
  • Next, look for the fuel rail connector which is connected to engine block with screws. Unfasten the screws and remove the fuel injector along with the rail.
  • Remove the defective fuel injector from the rail and install a new fuel injector in its place.
  • If more than one fuel injectors are defective, replace them in the same way. Once all the new fuel injectors are installed on the fuel rail, put it back onto the engine block and secure it with screws.
  • Take a small drive to make sure that the new fuel injectors are functioning properly.

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