An eight digit identification number is located on the
fuel rail assembly. Refer to this number if servicing or part replacement
is required. Before removal, the fuel rail assembly may be cleaned with
a spray type engine cleaner, GM X-30A or equivalent, following package
instructions. Do Not soak fuel rails in liquid cleaning solvent.
Notice:
• | Remove the attaching bolts securing the fuel rail
assembly to the lower intake manifold in order to prevent damage to the fuel
rail assembly. |
• | Carefully remove the fuel rail assembly in order to prevent damage
to the injector electrical connector terminals and the injector spray tips. |
• | Cap the fittings and plug the holes plugged when servicing the
fuel rail in order to prevent dirt and other contaminants from entering open
lines and passages. Clean the fuel rail assembly with a GM X-30A spray
type engine cleaner or the equivalent before removal. Do Not submerge the
fuel rail in a cleaning solvent |
Removal Procedure
Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing
any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to
the vehicle or its components.
- Disconnect
the negative battery cable.
- Relieve the fuel system pressure. Refer to the
Fuel Pressure Relief
.
- Remove the intake manifold plenum. Refer to
Intake Manifold Disassemble
in Engine Mechanical.
- Disconnect the engine fuel pipes at the rail.
- Remove the engine fuel pipe bracket bolt.
- Remove the fuel inlet and return line O-rings and discard.
- Disconnect the injector electrical connector.
- Remove the fuel rail retaining
bolts (1), (3), and (5).
- Disconnect the vacuum hose line to pressure regulator.
- Remove the fuel rail (2) from the intake manifold (4).
- Remove the injector O-ring seal from the spray tip end of each
injector. Discard the seals. With the O-ring removed, the O-ring backup may
slip off of the injector. Be sure to retain O-ring backup for reuse.
Installation Procedure
Important: Ensure that the O-ring backups are on the injectors before installing
the new O-rings. Lubricate the new injector O-ring seals with clean engine
oil and install on the spray tip end of each injector.
- Install the fuel rail
assembly (2) in intake manifold (4). Tilt the rail assembly to install the
injectors.
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.
- Install the fuel
rail attaching bolts (1), (3), and (5).
Tighten
Tighten the fuel rail attaching bolts to 10 N·m (89 lb in).
- Connect the injector electrical connectors.
- Install the new O-rings on the fuel pipes.
- Connect the fuel feed and return lines.
Tighten
• | Engine fuel pipe nuts to 27 N·m (20 lb ft). |
• | Use a back-up wrench on the fittings to prevent them from turning. |
Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing
any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to
the vehicle or its components.
- Connect the negative battery cable.
- Install the fuel filler cap.
- Check for fuel leaks.
8.1. | Turn the ignition switch to the ON position for 2 seconds. |
8.2. | Turn the ignition switch to the OFF position for 10 seconds. |
8.3. | Again, turn the ignition switch to the ON position. |
8.4. | Check for fuel leaks. |
- Install the intake manifold plenum. Refer to
Intake Manifold Assemble
in Engine Mechanical.