![]() The electrical connectors to each fuel injector are unlocked and removed. The supply and return lines are removed from the fuel rail.The upper plenum on the intake manifold is removed along with any cables, hoses, or wiring that restricts access.Once the engine is cold, the pressure within the fuel rail is relieved by briefly running the engine with the fuel pump fuse out.Either option requires removing the injector from the car and the following procedure is typical: The choice to repair versus replace will depend on exactly what is wrong with the injector as well as customer preference. If the injectors are serviced, specialized cleaning and test equipment are required. Injectors can be serviced once removed from the car or replaced outright with new injectors. ![]() How do mechanics replace a fuel injector? A professional injector service facility will clean each injector ultrasonically and replace these filters for a relatively low cost. All injectors have tiny internal filter baskets. When an engine is already disassembled, or if you are installing a new engine, that is a perfect time to service the injectors as a set. These deposits can cause an imbalance in the performance of the injectors from cylinder to cylinder. All fuel injectors will have deposits given enough mileage.
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