Notice: 

Caution: Remove the fuel tank cap and relieve the fuel system pressure before servicing the fuel system in order to reduce the risk of personal injury. After you relieve the fuel system pressure, a small amount of fuel may be released when servicing the fuel lines, the fuel injection pump, or the connections. In order to reduce the risk of personal injury, cover the fuel system components with a shop towel before disconnection. This will catch any fuel that may leak out. Place the towel in an approved container when the disconnection is complete.

1. Relieve the fuel system pressure.

Refer to Fuel Pressure Relief .

2. Disconnect negative battery cable.
3. Remove the upper manifold assembly. Refer to Engine Mechanical.
4. Remove the fuel return line retaining bracket screw assemblies.
5. Remove the fuel return line retaining bracket.
6. Move the return line away from the regulator.
7. Remove the pressure regulator assembly. Refer to Fuel Pressure Regulator Replacement .

Notice: 

•	Do not try to remove the fuel injectors by lifting up the fuel injector retaining bracket while the fuel injectors are still installed in the bracket slots. Improper removal may damage to the fuel injector retaining bracket and fuel injectors.

•	Remove the fuel pressure regulator before removing the bracket.




8. Remove the injector retainer bracket attaching screws.



9. Carefully slide the bracket off in order to clear the injector slots and the regulator.



10. Remove the electrical injector connectors.




Caution: Verify that the lower (small) O-ring of each injector does not remain in the lower manifold in order to reduce the risk of fire and personal injury.

If the O-ring is not removed with the injector, the replacement injector with new O-rings will not seat properly in the injector socket. Improper seating could cause a fuel leak.

Notice: Cover the injector sockets in order to prevent dirt and other contaminants from entering the open fuel passages.

Important: Each injector is calibrated for a specific flow rate. When replacing the fuel injectors, order replacements with the identical part number as the old injectors.

11. Remove the fuel injectors.
12. Discard the O-ring seals.

Caution: Verify that the lower (small) O-ring of each injector does not remain in the lower manifold in order to reduce the risk of fire and personal injury.

If the O-ring is not removed with the injector, the replacement injector with new O-rings will not seat properly in the injector socket. Improper seating could cause a fuel leak.
1. After lubricating the new injector O-ring seals with clean engine oil, install on the injector assembly.
2. Install the bottom feed Sequential injector assembly into lower manifold injector socket with electrical connectors facing inward.



3. Carefully install the bracket so that the injector retaining slots and the regulator are aligned with bracket slots.



4. Install the electrical injector connectors.
5. Install the pressure regulator assembly. Refer to Fuel Pressure Regulator Replacement .



6. Install the injector retainer bracket attaching screws. Refer to Thread Locking Material above.

Tighten
Tighten the injector retainer bracket attaching screws to 3.5 N·m(31 lb. in.).

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.

7. Install the upper manifold assembly. Refer to Engine Mechanical.
8. Install the accelerator cable bracket with attaching bolts and nuts.

Tighten

•	Tighten the accelerator cable bracket nut to 30 N·m(22 lb. ft.).

•	Tighten the accelerator cable bracket bolts to 25 N·m(18 lb. ft.).

9. Tighten the fuel filler cap.
10. Connect the negative battery terminal.
11. Turn the ignition switch to the ON position for 2 seconds.
12. Turn the ignition switch to the OFF position for 10 seconds.
13. Turn the ignition switch to the ON position.
14. Check for fuel leaks
15. Install the air intake duct.