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Home >> GMC >> 2013 >> Sierra 1500 XFE >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Controls/Fuel - 4.8L, 5.3L, 6.0L, 6.2L - Repair Instructions >> Repair Instructions >> Compressed Natural Gas High Pressure Regulator Replacement >> Installation Procedure

Installation Procedure

    Fig 1: Compressed Natural Gas High Pressure Regulator
    GM2920925Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Fastener Caution .

  1. Install the regulator (2) and retaining bolts (1) and torque to 19 (14 lb ft).
    2. Fig 2: Fuel Inlet And Outlet Lines
    GM2920930Courtesy of GENERAL MOTORS COMPANY
  2. Install coolant lines to fittings on regulator and apply spring clamps. Remove hose clamp pliers
  3. Install new O-ring on fuel inlet and outlet fittings and lubricate the new O-ring with petroleum jelly or equivalent before installation.
  4. Install the fuel inlet line to the regulator (2) and torque to 35 (26 lb ft).
  5. Install the fuel outlet line to the regulator (1) and torque to 24 (18 lb ft).
    6. Fig 3: Fuel Tank Pressure Sensor
    GM2920932Courtesy of GENERAL MOTORS COMPANY
  6. Connect the coolant temperature (1), fuel lock off (2), and fuel tank pressure sensor (3) electrical connectors.
    7. Fig 4: Regulator And Fuel Pump Control Module Mounting Bracket
    GM3222992Courtesy of GENERAL MOTORS COMPANY
  7. Install the fuel pump control module mounting bracket (2).
  8. Install the regulator and fuel pump control module mounting bracket nuts (1) and torque to 9 (80 lb in).
  9. Lower vehicle and re-pressurize the fuel system and test for leaks.
  10. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (TP2 - Auxiliary Battery) , Battery Negative Cable Disconnection and Connection (Single Battery) .
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