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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 Filler Check Valve Replacement >> Removal Procedure

Removal Procedure

    WARNING:

    Natural gas is highly flammable. In order to reduce the risk of fire and personal injury, keep sparks, flames, and smoking materials away from the vehicle while you perform the Compressed Natural Gas (CNG) fuel system service.

    WARNING:

    The Compressed Natural Gas (CNG) system operates at pressures up to 24820 kpa (3600 psi). Relieve the CNG fuel system pressure before servicing CNG fuel system components in order to reduce the risk of fire and personal injury.

  1. Relieve the compressed natural gas (CNG) fuel system pressure. Refer to Compressed Natural Gas Fuel Pressure Relief (With CH-48027) .
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  3. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
    4. Fig 1: Compressed Natural Gas Tank Filler Check Valve Fitting
    GM2563073Courtesy of GENERAL MOTORS COMPANY
  4. Disconnect the fill line fitting at the check valve and discard the O-ring.
  5. Remove the check valve from the fitting and discard the O-ring.
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