Jeep RL037479AB Injector-Fuel

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A leaking fuel injector can cause fuel knock, poor acceleration, low fuel economy, rough idle and misfire. It is recommended to have any checks on diesel fuel injectors done by a dealer service department or qualified diesel repair facility, as injector tests require special high-pressure testing equipment and adapters. Removing and installing the injectors requires expensive special tools, making it not recommended to attempt this job at home. It is generally more cost-effective to have this job done by a dealer service department or diesel specialist.

To change the fuel injectors, remove the upper intake manifold. Unplug any vacuum hoses and electrical connectors that inhibit fuel rail removal. Take out the ignition coils and clean any debris around the injectors. Detach the fuel rail and injectors as a unit. Disconnect the supply line and the electrical connectors from the injectors. Detach the fuel rail and injectors together.

Coat the new O-rings with clean engine oil and install them on the injectors. Install the injectors into the fuel rail and secure with the injector clips. Guide the injectors/fuel rail assembly into the injector bores on the intake manifold and tighten the fuel rail mounting bolts. After installation, turn the ignition switch to On to activate the fuel pump and check for fuel leakage.

Remove the engine cover and the air inlet tube. Disconnect the fuel supply line and the electrical connectors from the fuel injectors. Detach the PCV hose and the air make-up hose. Remove the fuel rail mounting bolts and carefully pull and wiggle the injectors to remove them. Remove the fuel rail and injectors as a single assembly.

Symptoms may include fuel knock, poor acceleration and performance, low fuel economy, rough engine idle, and engine misfire.

Symptoms may include fuel knock, poor acceleration and performance, low fuel economy, rough engine idle, and engine misfire.

Remove the injector retainer clip and pull the injector out. Replace the O-rings and lubricate them before installing the injector back into the fuel rail.