GM 12584908
Fuel Rail

Before changing any parts of the Fuel Rail and fuel injectors a technician should record the identification number written on the Fuel Rail which consists of 8 digits. The correct placement of Fuel Injector o-rings requires professionals to install the black ring at the top while the brown ring should go at the bottom when colors differ to reduce the risk of fires and fuel leak injuries. Secure the fittings using caps while inserting plugging material into the holes to protect against contamination during service work. The leakage of fuel injectors leads to the contamination of engine oil with fuel. Start your work by taking off the fuel feed pipe from the Fuel Rail after removing existing electrical connectors. Separate the process by starting with removal of the Intake Manifold upper section and harness connector bracket bolt and proceeding to disconnect the camshaft position sensor connector. To begin with you should extract the Fuel Rail bolts while also removing the Fuel Rail . Discard the o-rings you obtain from the spray tip end of each injector. Take precautions to stop the pins on Fuel Injector electrical connectors from bending as well as to prevent exposing nozzles to any cleaning agents. Removal of Fuel Injector retaining clip along with Fuel Injector out of the Fuel Rail requires discarding the upper o-ring. New o-ring seals must be activated during installation because reusing existing o-ring seals is not permitted. The Fuel Injector exhibits a stamped part number for identification. First apply engine oil on the new injector o-rings before installing an upper o-ring along with the Fuel Injector into the Fuel Rail according to necessity. Keep the Fuel Rail service process safe through proper port plug use to prevent contamination and avoid all methods of Fuel Rail assembly cleaning apart from engine oil lubrication. Injection rail assembly installation requires a slight tilt while the technicians insert it into the Intake Manifold. They should then apply clean engine oil to the new lower injector rings before installation. Secure the Fuel Rail bolts at 10 n.m (89 lb in) and after that join the cmp sensor electrical connector to the system. Secure the Fuel Injector harness connector bracket onto the Intake Manifold while installing its bracket bolt which should be torqued to 8 n.m (71 lb in). Put the upper Intake Manifold in place while you reattach all electrical connectors and join the fuel feed pipe to the Fuel Rail. Before concluding the procedure verify there are no fuel leaks by enabling the ignition for 2 seconds followed by 10 seconds of no power and a final 2 seconds of ignition power while monitoring for leaks.

Remove the fuel rail bolts and the fuel rail itself, followed by the O-ring from the spray tip end of each injector, discarding any damaged O-rings.

Cap the fittings and plug the holes.

Reconnect the negative battery cable and inspect for fuel leaks by turning the ignition on and off as specified.

Remove the fuel rail bolts and the fuel rail itself, then take off the O-ring from the spray tip end of each injector, discarding any damaged O-rings.

Exercise caution to avoid damaging the fuel injectors' electrical connector terminals and spray tips.

Disconnect the generator electrical connector and remove the connector position assurance (CPA) retainer.

Engine oil may become contaminated with fuel.

Disconnect the fuel feed pipe from the fuel rail, then disconnect any remaining electrical connectors.

Disconnect the fuel feed line quick connect fitting.

Connect the negative battery cable and inspect for fuel leaks by turning ON the ignition with the engine OFF for 2 seconds, turning OFF the ignition for 10 seconds, then turning ON the ignition again and checking for leaks.

Install the black O-ring in the upper position and the brown O-ring in the lower position to minimize the risk of fire and personal injury from fuel leaks.

Press the fuel rail until the injectors are fully seated.