Fuel Filter and Water Separator Service

Replace the fuel filter/water separator at intervals according to the Maintenance Inspection Schedule.

Important Replace the primary and secondary filters as a pair. Do not replace just one filter.

Parent topic: Engine Fuel System

Primary Fuel Filter / Water Separator

Removal

  1. Turn the unit OFF and disconnect the negative battery terminal to ensure unit cannot be operated.

  2. Unscrew the water level sensor (5) 1/4 - 1/2 turn and drain the fuel into a suitable container. Dispose of the drained fuel according to local regulations.

    Note A hose can be attached to the water level sensor fitting (6) to help drain the bowl.

  3. Remove the water level sensor (5) from the fuel filter bowl (4). Inspect the gasket and replace if necessary.

  4. Unscrew and remove the fuel filter bowl (4). Inspect the O-ring and float and replace if necessary.

  5. Unscrew the and remove the fuel filter (3). Discard the fuel filter according to local regulations.

  6. Clean the water level sensor, filter bowl and filter head.

Installation

  1. Lubricate the new fuel filter O-ring with clean engine oil.

  2. Install the new fuel filter into the filer head and hand tighten. Then tighten the filter to specification: 27 Nm (20 ft-lbs).

    Important A filter wrench can only be used on black plastic filter ring, NOT on the filter body.

  3. Lubricate the fuel filter bowl O-ring with clean engine oil.

  4. Install the fuel filter bowl onto the new fuel filter and hand tighten. Then tighten the filter bowl to specification: 27 Nm (20 ft-lbs).

  5. Install the water level sensor onto the bowl and hand tighten. Then tighten to specification: 7 Nm (5 ft-lbs).

    Important Do not pre-fill the fuel filter or bowl.

  6. Replace the secondary fuel filter, then prime the fuel system as shown in this chapter.

1. Bleed Screw 4. Fuel Filter Bowl Assembly
2. Filter Head 5 Water Level Sensor
3. Fuel Filter Assembly 6. Water Level Sensor Fitting

Secondary Fuel Filter

Removal

  1. Turn the unit OFF and disconnect the negative battery terminal to ensure unit cannot be operated.

  2. Place a suitable drain pan under the fuel filter.

    3. Important ONLY use a filter wrench on the black plastic threaded ring to loosen the filter. DO NOT grab the filter body with a filter wrench or strap wrench.

  3. Use a filter wrench on the black threaded ring to unscrew the filter 1 - 2 turns. Drain the fuel from the filter head into a suitable container.

  4. Remove the filter from the filter head (3). Dispose of fuel and filter according to local regulations.

  5. Clean the filter head.

Installation

Important Do not pre-fill the fuel filter.

  1. Lubricate the new fuel filter O-ring with clean engine oil.

  2. Install the new fuel filter into the filer head and hand tighten until the fuel filter contacts the filter head.

    Important Do not use a filter wrench to install fuel filter - hand tighten only.

  3. Prime the fuel system as shown in this chapter.

1. Bleed Screw 3. Filter Threaded Ring - Use to loosen filter with filter wrench
2. Filter Head 4. Fuel Filter Body - DO NOT use filter wrench on filter body

Filter Icon Identification

The icons shown below are located on the fuel filter label. Use the table below for label identification.

Primary Filter (A) Secondary Filter (B)
1. Drain Bowl /Remove Water Sensor 8. Do Not Use Tools for Service
2. Remove Filter Bowl and Filter 9. Do not Pre-Fill New Filter
3. Do not Pre-Fill New Filter 10. Lubricate O-rings and Threads with Fresh Engine Oil
4. Lubricate O-rings and Threads with Fresh Engine Oil 11. Hand Tighten Filter Until Filter Contacts Filter Head
5. Filter and Bowl Torque Specification    
6. Install Bowl Drain / Water Sensor    
7. Drain Water Daily