GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 GMC MD Steel Tilt (W Model) 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, and 6.0L 🢒 Fuel Rail and Injectors Installation

    Caution: Refer to Fuel Rail Stop Bracket Installation Caution in the Preface section.


    Object Number: 260176 Size: SH

    Important: DO NOT use fuel injector O-ring seals again. Install NEW fuel injector O-ring seals during assembly.

  1. Lubricate the NEW fuel injector O-ring seals with clean engine oil.
  2. Install the O-ring seals onto the fuel injectors.
  3. Install a new O-ring seal to the right side of the crossover tube.
  4. Assemble the crossover tube and bolt to the right fuel rail.
  5. Install the fuel rail, with fuel injectors, into the intake manifold.

    6. Press evenly on both sides of the fuel rail until all of the injectors are seated in their bores.

  6. Apply a 5 mm (0.2 in) band of threadlock to the threads of the fuel rail bolts. Refer to Sealers, Adhesives, and Lubricants .

    7. Notice: Refer to Fastener Notice in the Preface section.

  7. Install the fuel rail bolts.

    8. Tighten

    1. Tighten the fuel rail bolts to 10 N·m (89 lb in).
    2. Tighten the crossover tube right side retaining bolt to 3.8 N·m (34 lb in).

    Object Number: 260098 Size: SH
  8. Install the fuel rail stop bracket and bolt.

    9. Tighten
    Tighten the fuel rail stop bracket bolt to 50 N·m (37 lb ft).