Replacement of the CNG High-Pressure Fuel Filter

wv mm 47.01.000
Warning: Compressed natural gas is highly flammable. See the safety precautions listed, see CNG General Information of the Walk-In Van Chassis Operator's Manual or of the Walk-In Van Chassis Workshop Manual, or take the vehicle to an authorized Freightliner dealer. Failure to observe these precautions could lead to the ignition of the natural gas, which could cause severe bodily harm, or death, or property damage.

The high-pressure fuel filter is located inside of the left-hand frame rail, near the rear of the fuel tank.

  1. Shut off the fuel supply at the tanks.
  2. Vent the fuel supply system.
  3. After the system has been vented, remove the filter housing. See Fig..
  4. Remove and discard the O-ring used to seal the filter housing.
  5. Remove and discard the filter element.
  6. Install the new element and press it into place.
  7. Install the new O-ring.

    1. Fuel Filter Head

    2. Filter Element

    3. O-Ring

    4. Filter Housing

    5. Filter Drain

    Fig. 1, CNG High-Pressure Fuel Filter Assembly

  8. Apply a thread lubricant to the housing threads, and screw the filter housing onto the filter head.
  9. Check for leaks using a natural gas detector.
  10. Tighten the filter housing.
  11. Turn the fuel supply back on at the tanks.
Note:
Parent topic: Fuel
Document Number: 0000117170
Manual Publication Date: 2024-05-14
Topic Publication Date: 2024-11-19