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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 251 (Engine Controls - Removal & Installation) >> Relays & Solenoids >> High Pressure Lock-Off Solenoid >> Removal

High Pressure Lock-Off Solenoid: Removal

WARNING: This page is about a different car, the 2003 Pontiac Sunfire and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Relieve the CNG fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE (CNG)  under FUEL SYSTEMS (CNG).
  2. Disconnect the negative battery cable.
  3. Remove spare tire cover. Remove jack and tool kit. Remove spare tire. Remove 4 tank cover bolts. Remove the tank cover. See Figure.
  4. Vent the fuel pressure from the tank. See FUEL TANK VENTING  under FUEL SYSTEMS (CNG)..
  5. Remove the vent hose (6) from the High Pressure Lock-Off (HPL) solenoid. See Figure.
  6. Remove the fuel line fittings and discard the "O" rings.
  7. Remove the manual vent tool.
  8. Disconnect the Pressure Relief Device (PRD) outlet line (4).
  9. Remove the PRD line fitting (4).
  10. Remove the HPL harness connector bracket stand-offs.
  11. Using the HPL Crowfoot (J 43602) removal tool, or equivalent, loosen the HPL. See Fig 1.
  12. Remove the HPL from the CNG fuel tank and discard the HPL and "O" ring.
  13. If fuel contamination is suspected remove and clean the CNG tank prior to installing the new HPL. See FUEL TANK  under FUEL SYSTEMS (CNG). See FUEL TANK CLEANING (CNG) under FUEL SYSTEMS (CNG) in SYSTEM & COMPONENT TESTS - 2.2L ALERO, CAVALIER, GRAND AM & SUNFIRE article.
Fig 1: Loosening HPL
G00071008Courtesy of GENERAL MOTORS CORP.
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