Cadillac 12629927 Direct Fuel Injector Assembly

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If a special tool is not available, the Teflon seal can be installed by working it onto a socket and sliding it onto the injector.

When performing fuel system maintenance on various engine types, it's crucial to follow specific steps. For instance, before any work, relieve fuel system pressure and disconnect the negative battery terminal. Depending on the engine type, procedures vary: for the 3.2L V6, you remove the upper intake manifold, disconnect electrical connectors from fuel injectors, detach the vent hose, remove fuel rail support bolt, and extract the fuel rail with injectors as a unit; for the 2.8L and 2004-2009 3.6L V6 engines, you also disconnect injector connectors, remove fuel rail mounting bolts, and similarly extract the fuel rail and injectors together; for the 3.0L and 2008-later 3.6L V6 engines, you remove the intake manifold, foam insulator, fuel pressure sensor, and high-pressure fuel line, then remove fuel rails, and injectors in sequence. To work on these injectors, replace O-rings and use specific tools for Teflon seal installation or an alternative method without special tools. Afterward, reinstall injectors and fuel rail, ensuring proper seating and tightening. For the 5.7L and 6.0L V8 engines, clean around fuel injectors, disconnect wiring and fuel feed line, remove bolts securing the fuel rail, remove injectors, replace O-rings, and reinstall. Lastly, for the 6.2L V8 engine, disconnect the fuel supply line, remove intake manifold covers, disconnect various connectors, remove fuel rail fasteners, extract injectors, replace O-rings, and follow the reverse process for installation. Reconnect the negative battery terminal, activate the fuel pump, and check for fuel leaks in the lines, rails, and injectors.

The initial steps are to relieve the fuel system pressure and disconnect the cable from the negative battery terminal.

Insert each injector into its bore in the fuel rail and install the isolators with new seals on the injectors if equipped.