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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1168 (Engine Controls - 6.0L - Alternative Fuels (Introduction)) >> Repair Instructions >> Fill Line Union (Check Valve) Replacement (Cab/Chassis) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    CAUTION: Refer to Compressed Natural Gas (CNG) Flammability Caution in Cautions and Notices.
    CAUTION: Refer to Compressed Natural Gas (CNG) Fuel Pressure Relief Caution in Cautions and Notices.
  1. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure .
    2. CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure (Single Battery) Battery Negative Cable Disconnect/Connect Procedure (Auxiliary Battery) in Engine Electrical in the C/K Pickup service manual.
  3. Remove the truck body as required on ZW9 equipped vehicles in order to gain access to the CNG fuel tank.
    4. Fig 1: Identifying Fuel Line Hold-Down Components
    GM1203079Courtesy of GENERAL MOTORS CORP.
  4. Disconnect the fuel fill hose from the check valve (4).
  5. Disconnect the fuel fill line from the check valve (4).
  6. Remove the check valve mounting bolt (4).
  7. Remove the check valve from the vehicle.
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