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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 449 (Engine Controls - Removal & Installation - Bi-Fuel & CNG) >> Relays, Motors & Solenoids >> High Pressure Lock-Off Solenoid >> Removal

High Pressure Lock-Off Solenoid: Removal

WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the fuel tank shield. See FUEL TANK SHIELD  under FUEL SYSTEMS. Release fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE  under FUEL SYSTEMS.
  2. Disconnect the negative battery cable. Disconnect the vent hose from the High Pressure Lock-Off (HPL) Solenoid. Remove the manual vent tool and all fittings.
    3. NOTE: It is not necessary to remove the front (mid-frame) mounted CNG fuel tank from the CNG equipped vehicle in order to remove the HPL solenoid.
  3. Remove the fuel tank from the vehicle. See FUEL TANKS  under FUEL SYSTEMS. Vent the CNG fuel pressure from the tank. See FUEL TANK VENTING PROCEDURE  under FUEL SYSTEM PRESSURE RELEASE under FUEL SYSTEMS.
  4. Disconnect the vent hose from the HPL. Remove the manual vent tool and all fittings. Remove the fuel inlet fitting from the HPL solenoid and discard the "O" rings. Remove the fuel outlet fitting from the HPL solenoid and discard the "O" rings. Using HPL Crowfoot (J 43602), loosen the HPL solenoid.
  5. Unthread the HPL solenoid from the CNG fuel tank and discard the "O" ring. Inspect the inside of the CNG fuel tank for water, rust, or other contaminants. If necessary, clean the CNG fuel tank. See FUEL TANK CLEANING  under FUEL SYSTEMS.
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