GMC 12613411 Sequential Multiport Fuel Injector Assembly

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First, remove the intake manifold cover to get it off the fuel injectors on a vehicle. It is also necessary to relieve the fuel system pressure and disconnect the negative battery terminal cable. After that, air intake and manifold cover bracket bolts are removed as well as the nut holding engine wiring harness bracket to intake manifold. Electrical leads in engine wiring harness traced and disconnected from various components including alternator, EVAP purge solenoid, ignition coils, MAP sensor and throttle body. Also, electrical connectors from fuel injectors were disconnected; engine wiring harness clips were detached too. The PCV hose is disconnected from the intake manifold while the fuel line is disconnected from the fuel rail. The EVAP canister purge solenoid is removed from the intake manifold while the fuel rail mounting bolts are removed. Thereafter, injectors are disengaged from engine as an assembly through lifting them out of top of intake manifold by each individual injector retainer with its old o-ring removed.New o-rings should be installed after which they are lubricated with clean engine oil before reassembling both injectors and fuel rail. This process however must be done in reverse starting by tightening up of fuel rail mounting bolts and then pressurizing of fuel system so as to ensure there are no leaks occurring during installation.

To remove the upper intake manifold, first disconnect the negative battery cable and relieve fuel system pressure. Disconnect various electrical connectors, including those for the EVAP canister purge solenoid and MAP sensor, and remove the PCV crankcase ventilation hose. Remove the upper intake manifold mounting bolts and throttle body mounting studs, and discard the old gasket. To remove the fuel pulsation damper, remove the retaining clip and pull it out of the Throttle Body, then discard the old o-ring. To remove the throttle body and injectors, remove the fuel supply line and various seals, detach the injector poppet nozzles, and remove the injector retainer nuts and retainer. Installation for all components is the reverse of removal, using new gaskets and o-rings where necessary and tightening fasteners to proper torque specifications.

Disconnect the negative battery cable and relieve fuel system pressure.

Relieve the fuel system pressure and disconnect the cable from the negative battery terminal.

The retaining clip should be removed and the O-rings and seals should be replaced.

The injectors are disengaged from the intake manifold as a single assembly.

Remove the fuel supply line and various seals, detach the injector poppet nozzles, and remove the injector retainer nuts and retainer.

The air intake and manifold cover bracket bolts need to be removed, along with the nut securing the engine wiring harness bracket to the intake manifold.

Remove the PCV crankcase ventilation hose.

The electrical connectors from the fuel injectors need to be disconnected, and the engine wiring harness clips need to be detached.

Ensure the fuel rail mounting bolts are tightened. - Activate the fuel pump by turning the ignition switch to On without operating the starter. - Cycle the ignition On and Off several times. - Check for fuel leakage in the fuel lines, fuel rail, and injector.

Remove the fuel supply line and various seals, detach the injector poppet nozzles, and remove the injector retainer nuts and retainer.

Disconnect various electrical connectors, including those for the EVAP canister purge solenoid and MAP sensor.

The electrical leads from various components, including the alternator, EVAP purge solenoid, ignition coils, MAP sensor, and throttle body, need to be traced and disconnected.

After removing the intake manifold cover, the fuel system pressure needs to be relieved and the cable from the negative battery terminal needs to be disconnected.