GM 12623366
Fuel Rail

The first step for replacing the fuel injection Fuel Rail assembly for bank 2 is to reduce fuel system pressure. Start by removing the fuel pipe shield together with the high pressure fuel sensor. Start by removing the Fuel Rail crossover pipe which then gets disposed. The bank 2 Fuel Rail must be carefully lifted with care toward the engine opening after you remove its Fuel Rail bolts. All direct Fuel Injector hold down clamps must be discarded because rebuilding is required after free release from Fuel Rail or cylinder head positions. The procedure requires rebuilding of all fuel injectors following the removal of the Fuel Rail. Reinstall the rebuilt direct fuel injectors throughout the cylinder heads by using new direct injector hold down clamps for securing. Apply gm p/n 12345610 (Canadian P/N 9931930) or equivalent engine oil as a lubricant to the Fuel Injector cups of the new Fuel Rail. Start positioning the Fuel Rail by setting the front end against the front injector while turning the rear section downwards. Start by tightening first the two outer Fuel Rail bolts before proceeding with the two inner bolts while keeping hand pressure on the wrench. The technician should tighten the Fuel Rail bolts with a specified order starting from 12 nm (106 lb in) in the first pass followed by 23 nm (17 lb ft) in the final pass. The technician should begin by installing the new crossover fuel pipe and high pressure fuel sensor but must pay attention to secure proper routing of the electrical wires to prevent damage. Connect the electrical connector of the Fuel Injector wiring harness to all three components which include fuel injectors and Fuel Rail and fuel pressure sensor. A leak inspection procedure entails turning on the ignition while the engine stays off for 2 seconds followed by 10 seconds of engine off and a second ignition turn-on to check for fuel leaks. The replacement sequence concludes with the installations of the fuel pipe shield and low side fuel pressure service port cap and fuel tank cap.

The first step to replace the fuel injection Fuel Rail assembly for bank 1 (LLT) (3.6L) requires using ch-48027 or without it to relieve fuel system pressure before beginning the work. The first step includes removal of the fuel pipe shield followed by removing the Intake Manifold. First you should detach the high pressure fuel pipe then throw it away alongside the Fuel Rail crossover pipe. Start by extracting the foam insulation from between the fuel rails before unconnecting the Fuel Pressure Sensor wiring link and severing the harness tie straps. The procedure to remove the Fuel Rail requires taking off its mounting bolts together with the Fuel Pressure Sensor while discarding all direct Fuel Injector hold down clamps since these injectors need rebuilding when separated from their Fuel Rail position or cylinder head placement. Rebuilding fuel injectors should be performed after removing the Fuel Rail. Rebuilt direct fuel injectors must enter the cylinder heads while new direct injector hold down clamps need installation. A new Fuel Rail requires lubrication of its injector cups with gm p/n 12345610 (Canadian P/N 9931930) silicon-free engine oil or equivalent before proper placement. Begin installation by securing the outer Fuel Rail bolts followed by the inner bolts while finishing the installation by hand tightening them. The bank 1 Fuel Rail bolts should receive initial torque of 12 nm (106 lb in) and final torque should be 23 nm (17 lb ft). The installation process starts with introducing a new high pressure fuel pipe along with a new Fuel Rail crossover pipe. Mount and connect the high pressure fuel sensor while joining the Fuel Injector wiring harness electrical connector to the fuel injectors and Fuel Rail and Fuel Pressure Sensor. Check for fuel leaks during an ignition turn-on and turn-off procedure. The last step involves both reinstallation of the foam insulator along with the Intake Manifold along with the fuel pipe shield along with the low side fuel pressure service port cap and the fuel tank cap.

Remove the fuel rail bolts and use the EN-49248 (Injector Rail Assembly Remover) to take out the fuel rail and injectors as an assembly.

Lubricate the fuel injector cups with silicon-free engine oil GM P/N 12345610 or equivalent.

Install the rebuilt direct fuel injectors to the cylinder heads and secure them with new hold down clamps.

Take out the fuel rail crossover pipe and discard it.

Discard the high-pressure fuel pipe and the fuel rail crossover pipe after removal.

Rebuild the fuel injectors.

Carefully position the fuel rail, securing it with the outer bolts first, followed by the inner bolts, and hand tighten.

Discard the direct fuel injector hold down clamps, as the direct fuel injectors must be rebuilt whenever they are released from the fuel rail or cylinder head.