GM 12575952 Rail Asm,Multiport Fuel Injection Fuel

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To remove the fuel injectors, first relieve the fuel system pressure and disconnect the negative battery terminal. Remove the engine cover and the air intake duct. For four-cylinder models, clean the fuel injector areas with compressed air, then unbolt the fuel line support bracket and disconnect the fuel line from the rail and the quick-connect fitting. Disconnect the wiring from the fuel injectors, remove the fuel rail mounting bolts, and extract the fuel rail with its injectors. Release the fuel injector retaining clips and remove each injector, discarding the upper and lower O-rings. For 2002 and 2003 (3.0L) V6 models, disconnect the fuel line and intake manifold, disconnect wiring from the injectors, and remove the fuel rail with its injectors. For 2004 and later (3.5L) V6 models, remove the upper intake manifold, disconnect electrical connectors from the injectors, disconnect the fuel supply line, remove the fuel rail mounting bolts, and take out both fuel rails with injectors. Finally, for all models, coat new upper and lower O-rings with engine oil, install them on the injectors, insert the injectors into the fuel rail, and secure the fuel rail on the intake manifold. Reconnect the battery terminal, activate the fuel pump, and check for fuel leaks.

After installing the fuel rail and injectors, tighten the mounting bolts and high-pressure fuel line fittings to the correct torque specifications. Reconnect the battery and start the engine to check for fuel leaks.