GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 Sierra Denali 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, 6.0L and 6.2L 🢒 Fuel Rail and Injectors Installation

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


    Object Number: 1401978 Size: SH

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

  1. Lubricate the NEW fuel injector O-ring seals (532, 534) with clean engine oil.
  2. Install the O-ring seals to the fuel injectors.
  3. Install the fuel injectors (533) and retainers (521).

    4. Object Number: 1401976 Size: SH
  4. Install the fuel rail assembly (510) to the manifold. Push firmly on both sides of the rail until all the injectors have entered their bores.
  5. Apply a 5 mm (0.2 in) band of threadlock GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the threads of the fuel rail bolts. Refer to Adhesives, Fluids, Lubricants, and Sealers.

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

  6. Install the fuel rail bolts (511).

    7. Tighten
    Tighten the fuel rail bolts to 10 N·m (89 lb in).


    Object Number: 1401970 Size: SH
  7. Install the evaporative emission (EVAP) canister purge solenoid valve (730) and tubes (729, 735).

    8. 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).