GMC 12660709 Rail Assembly, Sequential Multiport Fuel Injection Fuel

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 replace the fuel injectors and fuel rails, relieve the fuel system pressure, disconnect the negative battery terminal, and disconnect the vacuum hose from the fuel pressure regulator. Disconnect the fuel injector electrical connectors and the fuel supply and return lines from the fuel rail. To install, coat the new O-rings with engine oil and insert the injectors. Install the injector retaining clip and mount the assembly onto the intake manifold.

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.

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.

First, relieve fuel system pressure and disconnect the negative battery cable. Remove the intake manifold and clean the fuel rail/injector area. Disconnect the fuel pressure regulator vacuum line, fuel injector harness connector, and fuel line fittings. Remove the fuel rail attaching bolts and free it from the cylinder head. Disconnect the electrical connector from the injector(s), remove the retaining clip(s), and remove the injector(s) from the fuel rail assembly. Replace the injector o-rings, lubricate them with clean engine oil, and press the injector into the fuel rail. Install the injector retaining clips and check the cylinder head injector holes for cleaning. After installation, check for fuel leakage. V8 Removal: Begin by relieving the fuel system pressure and disconnecting the negative battery cable. Remove the air intake duct and resonator, and disconnect any electrical connectors. Disconnect the accelerator cable and cruise control cable from the throttle body. Clean the fuel rail/injector area, disconnect the fuel injector electrical connectors and remove the PCV valve and hose. Disconnect the fuel supply and return lines from the fuel rail. Remove the fuel rail mounting bolts, and remove the fuel rail and injectors as an assembly. Replace the injector o-rings, lubricate them with clean engine oil, and press the injector into the fuel rail. Install the injector retaining clips and place the injector and fuel rail assembly on the intake manifold. After installation, check for fuel leakage.

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.

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

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.

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

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