Removal Procedure
- Relieve the fuel system pressure. Refer to the Fuel Pressure Relief .
- Clean the fuel rail assembly with a spray type engine cleaner, GM X-30A or equivalent, if necessary. Follow the package instructions.
- Disconnect the fuel feed and return pipes (2, 3) from the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
- Disconnect the fuel pressure regulator vacuum hose.
- Disconnect the positive crankcase ventilation (PCV) air tube from the cam cover.
- Disconnect the PCV valve (1) from the cam cover.
- Reposition the coolant surge tank inlet pipe. Refer to Radiator Surge Tank Inlet Hose/Pipe Replacement in Engine Cooling.
- Remove the fuel rail bracket retainer nut.
- Disconnect the fuel injector electrical connectors (1) from each fuel injector (2).
- Lay the harness aside.
- Remove the fuel rail attaching studs (2).
- Remove the fuel rail (1).
- Remove the injector lower O-ring seal from the spray tip end of each injector.
- Discard the O-ring seals.
Notice:
• Use care when servicing the fuel system components, especially
the fuel injector electrical connectors, the fuel injector tips, and
the injector O-rings. Plug the inlet and the outlet ports of the fuel rail
in order to prevent contamination. • Do not use compressed air to clean the fuel rail assembly as this
may damage the fuel rail components. • Do not immerse the fuel rail assembly in a solvent bath in order
to prevent damage to the fuel rail assembly.
Installation Procedure
- Lubricate the new lower injector O-ring seals with clean engine oil.
- Install the new O-ring seals on the spray tip end of each injector.
- Install the fuel rail (1).
- Install the fuel rail attaching studs (2).
- Connect the fuel injector electrical connectors (1) to each fuel injector (2).
- Install the fuel rail bracket retainer nut.
- Install the PCV valve to the cam cover (2).
- Install the coolant surge tank inlet pipe (1). Refer to Radiator Surge Tank Inlet Hose/Pipe Replacement in Engine Cooling.
- Install the PCV air tube to the cam cover.
- Connect the fuel pressure regulator vacuum hose.
- Connect the fuel feed and return pipes (2, 3) to the fuel rail. Refer to Metal Collar Quick Connect Fitting Service .
- Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
- Inspect for fuel leaks using the following procedure:
- Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical-4.0L.
Notice:
• Use care when servicing the fuel system components, especially
the fuel injector electrical connectors, the fuel injector tips, and
the injector O-rings. Plug the inlet and the outlet ports of the fuel rail
in order to prevent contamination. • Do not use compressed air to clean the fuel rail assembly as this
may damage the fuel rail components. • Do not immerse the fuel rail assembly in a solvent bath in order
to prevent damage to the fuel rail assembly.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Tighten
Tighten the studs to 10 N·m (89 lb in).
Tighten
Tighten the nut to 10 N·m (89 lb in).
| 13.1. | Turn ON the ignition, with the engine OFF for 2 seconds. |
| 13.2. | Turn OFF the ignition for 10 seconds. |
| 13.3. | Turn ON the ignition, with the engine OFF. |
| 13.4. | Inspect for fuel leaks. |
