The service process of the Fuel Rail requires fuel pressure gauge (J 34730-1A) and fuel line quick connect separator tool set (J 37088-A). When removing the Fuel Rail assembly disconnect the negative
Battery Cable while supporting the rail to maintain its structure and avoid damaging both terminals and spray tips. Open pipelines should be protected from contaminants by applying fitting caps and pipe plugs. You should use gm x-30a spray type engine cleaner or its equivalent to clean Fuel Rail assembly by removing left and right Fuel Rail covers, relieving fuel system pressure, then repeat the cleaning process. The maintenance technician should first disconnect the fuel feed hose from the Fuel Rail and disconnect the electrical connectors from each fuel injector before noting the injector position for restoration. Be aware of the location of the ground strap which needs reinstallation when it is situated on the
Intake Manifold. You need to take out the Fuel Rail attaching bolts followed by the removal of the Fuel Rail assembly but dispose of lower o-ring seals from each injector. The installation process requires clean engine oil lubrication of new lower injector o-ring seals before placing them onto each injector spray tip. A Fuel Rail stop bracket needs installation because it safeguards the Fuel Rail from frontal crashes. Threadlock gm p/n 12345382 with a 5 mm (0.020 in) band should be applied to Fuel Rail bolt threads before torquing each bolt to 10 n.m (89 lb in). Complete the electrical connection order of gas injectors and attach the fuel hose to the Fuel Rail before tightening the fuel cap and reconnecting the negative battery terminal. A leak inspection requires turning the ignition on for 2 seconds followed by 10 seconds off and then another activation of the ignition to verify fuel leaks. Before completing the installation you must put on right and left Fuel Rail covers and then program the transmitters and carry out an idle learn step.