Inspecting the Vaporizer

sd mm 47.04.005

See Fig. for plumbing component locations.

  1. Pressure Relief Device

  2. Fuel Inlet Line

  3. Check Valve

  4. CNG Quick-Connect Port

  5. Coolant Inlet Line

  6. Vaporizer

  7. Fuel Shutoff Solenoid Valve

  8. Coolant Outlet Line

  9. Pressure Gauge

  10. Overpressure Regulator

  11. Pressure Relief Valve

  12. Fuel Outlet Line

Fig. 1, LNG Vaporizer Assembly

  1. Ensure that the vaporizer is secured to its mounting brackets and that the mounting brackets are secured to the frame. Inspect for any signs of looseness.
  2. Inspect the vaporizer fuel inlet and outlet lines for signs of chafing, damage, or leaks.
  3. Inspect the vaporizer coolant hoses for signs of chafing, damage, or leaks.
  4. Inspect all fittings for leaks.
  5. Inspect the fuel shutoff solenoid valve for signs of leaks or damage. Inspect the solenoid mounting bracket for looseness.
  6. Inspect the overpressure regulator for signs of leaks or damage.
    1. Ensure that the regulator is mounted securely.
    2. Check the overpressure regulator fittings for signs of leaks or damage.
    3. Ensure that the adjustment handle locking nut (at the bottom of the overpressure regulator) is tightened securely.
    4. Inspect the pressure gauge for damage. Ensure that the gauge sight glass is clear and legible.
  7. Repair or replace any leaking or damaged vaporizer components.
Note:
Parent topic: LNG Fuel System Inspection
Document Number: 0000120396
Manual Publication Date: 2024-05-23
Topic Publication Date: 2025-08-18