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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 8 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - Repair Instructions) >> Repair Instructions >> Fuel Pump Replacement >> Installation Procedure

Installation Procedure

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    Fig 1: Lifter Oil Manifold Assembly
    GM2965631Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The camshaft must be in the base circle position before the fuel pump is installed.

  1. Use the EN-51092  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 top surface of the lifter oil manifold assembly (1).
    2. Fig 2: NEW High Pressure Fuel Pump Gasket
    GM2965632Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Ensure that the high pressure fuel pump roller lifter is oriented properly, the camshaft is at base circle and the number 1 piston is at top dead center (TDC) on the exhaust stroke.
    • Ensure the plastic fastener retainers (3) are installed in the high pressure fuel pump mounting holes before installing.
  2. Install a NEW high pressure fuel pump gasket (1).
  3. Install the high pressure fuel pump (2) and high pressure fuel pump cover (4).
    4. CAUTION:

    Refer to Fastener Caution .

    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.

  4. Install Fuel Pump Bolt (5) and tighten [2x] 25 N.m (18 lb ft)
  5. Position the fuel pump and fuel injector wiring harness and connect as necessary.
    6. Fig 3: Crossover Pipe And Fuel Feed Pipe Fittings
    GM2965634Courtesy of GENERAL MOTORS COMPANY
    NOTE:
    • Do NOT reuse the fuel feed intermediate pipe. If the fuel feed intermediate pipe fittings are loosened or the pipes are removed, the pipes MUST be replaced.
    • The tightening order and torque are CRITICAL to proper fuel system fit and function. Be sure to follow installation and tightening steps EXACTLY.
  6. Install a NEW fuel feed intermediate pipe (1). Fuel Feed Intermediate Pipe Replacement - Position 1 
    7. Fig 4: Low Pressure Fuel Feed Pipe, LH Rocker Cover Bolt, Redundant Clip And Fuel Pump
    GM2965635Courtesy of GENERAL MOTORS COMPANY
  7. Connect the fuel feed pipe (1) to the fuel pump (2). Press the fuel feed pipe until an audible click is heard and then install the redundant clip (3). Plastic Collar Quick Connect Fitting Service 
  8. Install the fuel feed pipe fastener (4) and tighten to 10 N.m (89 lb in).
    9. Fig 5: Fuel Pump Insulator
    GM2965636Courtesy of GENERAL MOTORS COMPANY
  9. Install the fuel pump insulator (1). Fuel Pump Insulator Replacement 
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