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Perform the following procedures for removal and installation of the fuel heat exchanger. ‪

Fuel Heat Exchanger Removal

Remove the fuel heat exchanger as follows: ‪


To avoid injury from fire, keep all potential ignition sources away from diesel fuel, including open flames, sparks, and electrical resistance heating elements. Do not smoke when refueling.

  1. Disconnect the batteries.
  2. Open the hood.


    To avoid injury from the sudden release of a high-pressure hose connection, wear a face shield or goggles.

  3. Disconnect the fuel lines on the heat exchanger. Discard the seal rings. See Figure 42115 .

    1. DDEC-ECU Control Unit ‪

    5. Seal Ring ‪

    2. Fuel Feed Line ‪

    6. Fuel Heat Exchanger Mounting Bolt ‪

    3. Banjo (Hollow-core) Bolt ‪

    7. Fuel Heat Exchanger Inlet ‪

    4. Banjo Fitting ‪

    8. Fuel Heat Exchanger ‪

    Fuel Heat Exchanger

    Note: Catch any fuel in a clean container.

  4. Remove the mounting bolts attaching the fuel heat exchanger to the DDEC-ECU control unit. Then remove the fuel heat exchanger.

    Note: Do not disassemble the fuel heat exchanger. It cannot be serviced.

Fuel Heat Exchanger Installation

Install the fuel heat exchanger as follows: ‪

  1. Attach the fuel heat exchanger to the DDEC-ECU control unit with the mounting bolts. Tighten the bolts 8 Nm (6 lbft).
  2. Connect the fuel lines to the fuel heat exchanger. Use new seal rings. Tighten the fuel lines 50 Nm (37 lbft).
  3. Close the hood.
  4. Connect the batteries.
  5. Prime the fuel system. Refer to section .