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HOMESERVICE MANUALSCHEVROLET2014EXPRESS 2500 BASE, VAN CARGO, 6.6L ENG VIN LREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 3 (ENGINE CONTROLS & FUEL - 4.8L (L20), 5.3L (LMF), OR 6.0L (L96 LC8) - REPAIR INSTRUCTIONS)REPAIR INSTRUCTIONSCOMPRESSED NATURAL GAS HIGH PRESSURE REGULATOR REPLACEMENTINSTALLATION PROCEDURE
2014 Chevrolet Express 2500 Base, Van Cargo, 6.6L Eng VIN L

Installation Procedure

2014 Chevrolet Express 2500 Base, Van Cargo, 6.6L Eng VIN LSECTION Installation Procedure
WARNING: This page is about a different variant/trim than selected.
    Fig 1: Locating High Pressure Regulator Coolant Lines
    GM2563037Courtesy of GENERAL MOTORS COMPANY
  1. Connect coolant lines to the original port locations on the HPR.
    2. CAUTION:

    Refer to Fastener Caution .

  2. Install HPR bracket assembly and torque to spec.
  3. Connect all electrical connections.
  4. Connect Fuel lines and torque to spec.
    • Tighten the HPR bracket nuts to 40 N.m (29.5 lb ft).
    • Tighten the high pressure fuel line fittings to 35 N.m (26 lb ft).
    • Connect the low pressure fuel line fitting to the HPR outlet fitting using a NEW O-ring. Lubricate the new O-ring with petroleum jelly or equivalent before installation. Tighten the low pressure fuel line tube nuts to 45 N.m (33 lb ft)
  5. Open ALL the CNG tank valves.
  6. Install ALL the fuel tank covers. Refer to Compressed Natural Gas Tank Cover Replacement - Aft Tank , Compressed Natural Gas Tank Cover Replacement - Cargo Tank  and Compressed Natural Gas Tank Cover Replacement - Midship Tank .
  7. Open 1/4 turn valve.
  8. Install the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  9. Add coolant if necessary. Refer to Cooling System Draining and Filling (Static Fill) , Cooling System Draining and Filling (Vac N Fill) .
  10. Start the vehicle and inspect for CNG fuel leaks at the serviced fittings with a commercially available combustible gas detector.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.