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High Pressure Regulator: Installation

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. Connect the coolant inlet and outlet hoses to the HPR.
  2. Remove the hose pinching clamps from the coolant inlet and outlet lines.
  3. Position the HPR through the mounting hole.
  4. Connect the HPR fuel outlet line to the HPR using a NEW "O" ring face seal. Lubricate the "O" ring with petroleum jelly, or equivalent. Tighten the fuel line fitting to specification. See TORQUE SPECIFICATIONS .
  5. Lower the vehicle.
  6. Install the mounting nut to the HPR. See Figure. Tighten the HPR mounting nut to specification. See TORQUE SPECIFICATIONS .
  7. Connect the HPL to HPR fuel line to the HPR using a NEW "O" ring face seal. Lubricate the "O" ring with petroleum jelly, or equivalent. Tighten the fuel line fitting to specification. See TORQUE SPECIFICATIONS .
  8. Connect the HPL power harness connector.
  9. Start the engine. Check for CNG fuel leaks at each serviced fitting using the Combustible Gas Detector (J 45878), or equivalent.
  10. Install the vent hose to the HPR. Tighten the clamp to specification. See TORQUE SPECIFICATIONS .
  11. Raise the rear seat.
  12. Check the coolant level. Add coolant as needed.


  1. Install the fuel line at the fuel filter inlet fitting using a NEW "O" ring face seal. Lubricate the "O" ring with petroleum jelly, or equivalent. Tighten the fuel line fitting to specification. See TORQUE SPECIFICATIONS .
  2. Connect the fuel line at the HPR fuel outlet fitting using a new "O" ring face seal. Tighten the fuel line fitting to specification. See TORQUE SPECIFICATIONS . Lubricate the "O" ring with petroleum jelly, or equivalent. See Figure.
  3. Connect the negative battery cable. Tighten to specification. See TORQUE SPECIFICATIONS .
  4. Start the engine. Check for CNG fuel leaks at each serviced fitting using the Combustible Gas Detector (J 45878), or equivalent.


  1. Install NEW seal, filter and spring.
  2. Install HPR inlet fitting using a NEW "O" ring. Lubricate "O" ring with petroleum jelly, or equivalent. Tighten HPR inlet fitting to specification. See TORQUE SPECIFICATIONS .
  3. Connect HPR-to-HPL to HPR using a NEW "O" ring seal. Lubricate "O" ring with petroleum jelly, or equivalent. Tighten fuel line fitting to specification. See TORQUE SPECIFICATIONS .
  4. Connect the HPL power harness connector.
  5. Start the engine. Check for CNG fuel leaks at each serviced fitting using the Combustible Gas Detector (J 45878), or equivalent.
  6. Install the vent hose to the HPR. Tighten the vent hose clamp to specification. See TORQUE SPECIFICATIONS .
  7. Raise the rear seat.
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