Intake Manifold Installation (LTG)

Special Tools

• EN-45059  Angle Meter
• EN-50790  HP Fuel Pump Installation Alignment Gauge

For equivalent regional tools, refer to Special Tools .

1. Install a NEW gasket (1) on the intake manifold (3). Install the intake manifold and hand start the intake manifold bolts (2, 4).
   Fig 1: Intake Manifold And Gasket

   Courtesy of GENERAL MOTORS COMPANY
2. Tighten the bolts and nuts in sequence twice to 12 N.m (106 lb in).
   Fig 2: Intake Manifold Bolt Tightening Sequence

   Courtesy of GENERAL MOTORS COMPANY
   CAUTION: Refer to Fastener Caution .
3. Install the MAP sensor (1) and bolt (2). Tighten the bolt to 5 N.m (44 lb in).
   Fig 3: MAP Sensor And Bolt

   Courtesy of GENERAL MOTORS COMPANY
4. Use the EN-50790  alignment gauge (2) to ensure that the camshaft lobe is in the base circle position. At base circle position, the tool will be flush with the head (1).
   Fig 4: View Of HP Fuel Pump Installation Alignment Gauge

   Courtesy of GENERAL MOTORS COMPANY
   NOTE: The camshaft must be in the base circle position before the high pressure fuel pump is installed.
5. Lubricate the high pressure fuel pump cylinder head bore with clean, silicone-free 5W30 engine oil.
   Fig 5: Fuel Pump Insulator

   Courtesy of GENERAL MOTORS COMPANY
6. Lubricate the high pressure fuel pump roller lifter (1) with 5W30 engine oil and install into the cylinder head bore.
   NOTE: Ensure that the high pressure fuel pump roller lifter is oriented properly and the camshaft is at base circle.
7. Lubricate the NEW O-ring (3) with one drop of clean engine oil. Install the NEW fuel pump housing O-ring (3).
8. Install the NEW fuel pump housing gasket (2).
   NOTE: Ensure the fuel pump housing gasket (2) is properly aligned with the tab upward at the 2 O'clock position.
9. Install the fuel pump assembly (4).
10. Apply theadlocker to the bolts, refer to Adhesives, Fluids, Lubricants and Sealers (LTG) .
    CAUTION: Alternately hand-tighten the fuel pump bolts one turn at a time until the pump is fully seated. Trying to draw down the pump without even side-to-side tightening may result in pump plunger damage.
11. Hand start the fuel pump assembly bolts (5) evenly. Tighten the fuel pump bolts evenly to 8 N.m (71 lb in) plus 50 degrees using the EN-45059  meter.
12. Hand start both ends of the NEW fuel feed intermediate pipe (5).
    1. Tighten the fitting nut to the fuel rail to 15 N.m (11 lb ft).
    2. Tighten the fitting nut to the fuel pump to 15 N.m (11 lb ft).
    3. Tighten the fitting nut to the fuel rail a final pass to 30 N.m (22 lb ft).
    4. Tighten the fitting nut to the fuel pump a final pass to 30 N.m (22 lb ft).
13. Install the fuel pump insulator (6).
    NOTE: Replace the noise cancelling foam component if it is exposed to and has absorbed automotive fluids.
14. Install the fuel pump cover and bolts. Tighten the bolts to 10 N.m (89 lb in).
    Fig 6: Fuel Pump Cover Bolts And Cover

    Courtesy of GENERAL MOTORS COMPANY
15. Install a new throttle body gasket (3).
    Fig 7: Throttle Body Bolts

    Courtesy of GENERAL MOTORS COMPANY
16. Install the throttle body (2).
17. Install the throttle body bolts (1) and tighten to 10 N.m (89 lb in).
18. Install the EVAP canister valve (1) and connect the EVAP canister valve tube.
    Fig 8: EVAP Canister Valve

    Courtesy of GENERAL MOTORS COMPANY
    NOTE: Ensure the quick-connect is clean and free of debris. The latch should move freely prior to installation.