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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 >> High Pressure Regulator (HPR) Replacement >> 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. Fig 1: View Of Fuel Tank And Fuel Tank Cover
    GM757009Courtesy of GENERAL MOTORS CORP.
  3. Remove the tank cover (2). Refer to Fuel Tank Cover Replacement .
    4. Fig 2: Identifying High Pressure Regulator (HPR) Components
    GM757008Courtesy of GENERAL MOTORS CORP.
  4. Partially drain the coolant or pinch off the high pressure regulator (HPR) coolant hoses (3, 5). Refer to Draining and Filling Cooling System (with HP2) Draining and Filling Cooling System (without HP2) in Engine Cooling in the C/K Pickup Service Manual.
  5. Loosen the hose clamps enough to move the clamps (2, 6) away from the HPR coolant fittings.
  6. Disconnect the HPR coolant hoses (3, 5) from the HPR.
  7. Disconnect the HPR fuel inlet line (9).
  8. Disconnect the HPR fuel outlet line (4).
  9. Remove the HPR fuel inlet line fitting from the HPR. Capture the filter spring, filter and seal that are located behind the fuel inlet line fitting.
    10. IMPORTANT: Do not hold the HPR using the HPR cover hex flange. As required, wedge a wrench between the HPR and the tank frame in order to keep the HPR from spinning in the bracket.
  10. Remove the HPR mounting nut (1).
  11. Remove the HPR from the mounting bracket.
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