ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – 006-017   Fuel Filter Head

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

WARNING  Fuel is flammable. Keep all cigarettes, flames, pilot lights, arcing equipment, and switches out of the work area and areas sharing ventilation to reduce the possibility of severe personal injury or death when working on the fuel system.

WARNING  Drain the fuel-water separator into a container, and dispose of contents in accordance with local environmental regulations.

CAUTION  Use caution when disconnecting or removing fuel lines. Replacing filters and priming the fuel system that fuel is not spilled or drained into the bilge area. Do not drop or throw filter elements into the bilge area. The fuel and fuel filters must be discarded in accordance with local environmental regulations.

NOTE: Some of the graphics used in this procedure may not match all applications. However, the procedure is the same except where noted.

• Disconnect the batteries. Refer to Procedure 013-009 in Section 13.
• Close the fuel supply valve, if equipped. Refer to the OEM service manual.
• Remove the fuel filter. Refer to Procedure 006-015 in Section 6.
• Disconnect the fuel supply and return line connections. Refer to Procedure 006-024 in Section 6.

Remove the fuel filter head mounting capscrews.

NOTE: Mark the location of the fuel inlet port to aid in the installation.

Remove the four filter head mounting capscrews and the fuel filter head.

Remove the fuel heater, if equipped. Refer to Procedure 005-008 in Section 5.

Remove the fuel line connections and compression o-ring seals.

Remove the test port access plugs.

Inspect the fuel filter head for cracks, passage blockage, and material or debris on the sealing surfaces.

Apply thread locker, Part Number 3375068 or equivalent to only the filter adapter threads that are engaging the fuel filter head.

Install the fuel filter adapter and fuel heater. Refer to Procedure 005-008 in Section 5.

NOTE: Make sure there is an o-ring between the fuel filter head and the heater.

Use new compression seal rings and install the 90-degree straight thread o-ring elbows in the fuel filter head. Tighten the elbows.

Use new compression seal rings and install the test port plugs. Tighten the plugs.

Install the fuel filter head.

Tighten the retaining capscrews.

Align the installation markings for the fuel inlet port.

Install the fuel filter head.

Tighten the retaining capscrews.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Connect the fuel return and supply lines. Refer to Procedure 006-024 in Section 6.
• Install the fuel filter. Refer to Procedure 006-015 in Section 6.
• Open the fuel supply valve, if equipped. Refer to the OEM service manual.
• Connect the batteries. Refer to Procedure 013-009 in Section 13.
• Operate the engine and check for leaks.