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Home >> Chevrolet >> 2012 >> Chevy Express H1500, Van Cargo >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Controls And Fuel - 4.8L, 5.3L, 6.0L - Repair Instructions >> Repair Instructions >> Compressed Natural Gas Tank Replacement - Aft Tank >> Installation Procedure

Installation Procedure

    CAUTION:

    Refer to Component Fastener Tightening Caution .

  1. The PRD and lines must be transferred to the new tank assembly before installation. Replace all O-rings with new seals and tighten fittings to 35 N.m (26 lb ft).
  2. Raise the tank assembly up to the bolt locations.
    3. Fig 1: Bracket Support Nuts
    GM2567343Courtesy of GENERAL MOTORS COMPANY
  3. Install the bracket support nuts. Tighten the mounting nuts to 79 N.m (60 lb ft).
  4. Connect the fuel inlet line to the tank valve using a new O-ring. Lubricate the O-ring with petroleum jelly or equivalent. Tighten the fitting to 35 N.m (26 lb ft).
    5. Fig 2: Manual Tank Valves
    GM2567262Courtesy of GENERAL MOTORS COMPANY
  5. Connect the electrical connectors at the HPL.
  6. Open the manual tank valve(s).
  7. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  8. Pressurize the CNG fuel system by cycling the ignition ON and OFF several times.
  9. Start the engine and use the J-45878  detector in order to inspect for CNG fuel system leaks at each serviced fitting.
  10. Install the trailer hitch. Refer to Trailer Weight-Distributing Hitch Platform Replacement .
  11. Install the fuel tank cover. Refer to Compressed Natural Gas Tank Cover Replacement - Aft Tank .
  12. Lower the vehicle
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