GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2007 🢒 Express - AWD 🢒 Engine 🢒 Engine Controls and Fuel - 6.6L (LMM) 🢒 Fuel Pressure Regulator Replacement

Removal Procedure

    Object Number: 786996 Size: SH
  1. Remove the center intake manifold. Refer to Center Intake Manifold Replacement .
  2. Disconnect the fuel pressure regulator electrical connector (1).
  3. Reposition the distribution block hose clamps.
  4. Remove the distribution block hoses from the distribution block.

    5. Object Number: 901300 Size: SH
  5. Clean the fuel pressure regulator and high pressure injection pump thoroughly with solvent, such as GM P/N 12377981 (Canadian P/N 10953463) or equivalent.
  6. Using compressed air, thoroughly blow dry the regulator and pump.
  7. Remove the 3 fuel pressure regulator screws (1) using a T25 TORX®.

    8. Object Number: 901301 Size: SH
  8. Remove the fuel pressure regulator (1).
  9. If dirt or debris is found in the bore or seating surfaces of the fuel injection pump, perform the following:
    10. • Place a clean rag over the bore on order to collect the excess fuel.
    • Bump the engine over in order to flush any debris out of the regulator bore.

Installation Procedure

Important: If the pressure regulator is being re-used, check the O-rings for damage. If the O-rings are damaged, install NEW O-rings.


    Object Number: 901301 Size: SH
  1. Lubricate and install NEW O-rings onto the regulator. Lubricate the O-rings with clean, NEW engine oil.

    2. Important: If the regulator is installed at an angle the O-rings may be damaged, resulting in possible fuel leakage.

  2. Install the fuel pressure regulator (1).

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


    Object Number: 901300 Size: SH
  3. Install the 3 fuel pressure regulator screws (1) using a T25 TORX®.

    4. Tighten

        • Tighten the screws a first pass to 4 N·m (35 lb in).
        • Tighten the screws a final pass to 7 N·m (62 lb in).
  4. Install the distribution block hoses to the distribution block.
  5. Position the distribution block hose clamps.

    6. Object Number: 786996 Size: SH
  6. Connect the fuel pressure regulator electrical connector (1).
  7. Install the air outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
  8. Install the center intake manifold. Refer to Center Intake Manifold Replacement .
  9. Prime the fuel system. Refer to Fuel System Priming .
  10. Start the engine.

    11. If the engine stalls, repeat the above step.

  11. Once the engine starts, inspect for fuel leaks.