OEM 2008 GMC Yukon Fuel Rail

2008 GMC Yukon Fuel Rail Parts and Q&A

• Q: How to replace the Fuel Injection Fuel Rail Assembly on 2008 GMC Yukon?

  A: The procedure for fuel injection Fuel Rail assembly replacement starts by first eliminating air cleaner outlet duct and then completing fuel system pressure relief in two ways using ch 48027 or without it. The first step involves removing the engine wiring harness bracket nut followed by disconnecting electrical connectors from evap purge solenoid as well as generator and MAP Sensor and electronic throttle control and ignition coil main electrical connector. Unplug all Fuel Injector electrical connectors before marking them for reinstallation and then take out the cpa retainer to disconnect additional connectors. Disassemble the cylinder head by removing terminal (2 and 3), negative battery cable stud, clips (4 and 6) and engine wiring harness from its location. Start by removing the bolt of the engine wiring harness clip and place the harness in a safe position aside. Remove the connections of the pcv hose alongside the chassis fuel feed pipe and evap tubes from their locations at the Intake Manifold and evap canister purge solenoid. First disengage the retainer of the evap canister purge solenoid then remove the Fuel Rail bolts. To avoid touching the injector electrical connectors or spray tips the technician should carefully take out the Fuel Rail assembly while using caps to protect all exposed fittings from contamination. Spray engine cleaner on the Fuel Rail while cleaning it before removing the Fuel Rail assembly evenly until completion. Get rid of the old Fuel Injector O-Ring seals (2 and 4) that should be discarded. Insert new o-ring seals onto the fuel injectors while applying clean engine oil to the seals before installing the fuel injectors with their retainers. Fully push the Fuel Rail toward the Intake Manifold until all injectors are properly positioned before tightening the Fuel Rail bolts to 10 n.m (89 lb in). Reinstall the evap tube after which you should add the purge solenoid and connect the evap tube fittings and the chassis fuel feed pipe. After repositioning the pcv hose install the engine wiring harness and tighten its clip bolt to 9 n.m (80 lb in). Tighten the terminal and stud connecting the negative battery cable to the cylinder head until they reach 25 n.m (18 lb ft). After connecting the ignition coil main electrical connector you must install the cpa retainer. When connecting the electronic throttle control and Fuel Injector connectors ensure that their cpa retainers remain properly in place. Connect the MAP Sensor to the generator while installing the evap purge solenoid and secure the engine wiring harness bracket nut at 5 n.m torque (44 lb in). Complete the procedure by reversing battery cable connection and leak check per instructions before reattaching the air cleaner outlet duct.