Chevrolet 12633513 Rail Assembly, Multiport Fuel Injection Fuel

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To remove the fuel injectors, start by relieving the fuel system pressure and disconnecting the cable from the negative battery terminal. Remove the engine cover(s) and disconnect the fuel supply line at the fuel rail. On supercharged models, remove the fasteners attaching the manifold to the front of the charge air cooler and disconnect the fuel injection electrical connectors, MAP, IAT, supercharger air output sensor connectors, PCV tube, and ignition coil electrical connectors. On non-supercharged models, disconnect the electrical connector from each fuel injector. Clean the intake manifold or supercharger where the injectors are inserted. Remove the fuel rail fasteners and the fuel rail assemblies. Disconnect the electrical connector from each fuel injector on supercharged models. Slide off the injector retaining clips and pull the injectors from the fuel rail. Remove the O-rings from the injectors. Coat the new O-rings with clean engine oil and slide them into place on each of the fuel injectors. Insert each injector into its bore in the fuel rail and secure them with the injector retaining clips. For installation, reconnect the cable to the negative battery terminal and turn the ignition switch to ON to activate the fuel pump and check for fuel leaks.

For V6 engines, removing the intake manifold and related components is necessary.