Fuel Filter Replacing, Propane Engine

s2 m 47.07.000

Warning: Liquid propane can cause serious burns should it contact the skin or eyes. When handling propane, always wear approved protective gloves and eye protection to prevent contact.

Propane is extremely flammable, and can ignite if an ignition source is present, causing burns and other serious injuries. Keep sparks and flames away from propane. Do not smoke near propane or when refueling the vehicle.

See the safety precautions listed, see of the S2 Chassis Operator's Manual, or take the vehicle to an authorized Freightliner dealer. Failure to observe these precautions could lead to the ignition of the liquid propane, which could cause severe bodily harm, or death, or property damage.

The propane system is equipped with two filters—one before the fuel enters the tank, and another before it enters the engine. The replacement procedure that follows applies to both filters. See Fig. and see Fig..

Important: Venting the fuel supply and return lines must be performed outside. Do not release propane inside a garage or building. Once the fuel lines are vented, the vehicle can be pulled into the garage.

  1. 1.Propane Fuel Filter

Fig. 1, Fuel Filter Location (fuel going in the tank)

  1. Propane Fuel Filter

Fig. 2, Fuel Filter Location (fuel going in the engine)

Notice: Damage may occur to the valve(s) if they are overtightened.

  1. Turn the fuel supply and return valves clockwise to shut them off at the tank.

    2. Note: Both the fuel supply and return lines must be vented to ensure all pressure is removed from the fuel rails and lines.

  2. To vent the system, slowly crack open the fuel supply and return lines that are connected to the supply and return valves until a white mist appears. Continue cracking the lines open until there is absolutely no pressure.
  3. Disconnect the fuel supply and return lines from the valves until all service work is finished.
  4. Cover the open lines to prevent contaminants from entering the system.
  5. Remove and discard the filter.
  6. Install the new filter, making certain the arrow on the filter points toward the tank or engine as applicable.
  7. Connect both ends of the filter to the fuel line and tighten 28±10 lbf·ft (38±14 N·m).
  8. Remove the protective cover from the fuel lines.
  9. Connect the fuel lines to their designated supply and return valve. Tighten the fuel line flare nuts 13 lbf·ft (18 N·m).

    10. Notice: Damage may occur to the valve(s) if they are overtightened.

  10. Turn the fuel supply and return valves counterclockwise, then start the vehicle in order to charge the fuel lines with propane.
  11. Check for leaks using an electronic leak detector or a liquid-leak detection solution.
Note:
Parent topic: Fuel
Document Number: 0000121082
Manual Publication Date: 2024-05-24
Topic Publication Date: 2024-11-13