If you want to change the diesel engine fuel filter yourself, here is how to do it:

Caution: Diesel fuel is flammable. It could start a fire if something ignites it, and you could be burned. Do not let it get on hot engine parts, and keep matches or other ignition sources away.

First, drain any water from the filter by following the water draining procedure earlier in this section.

The vehicle's engine should be off until the end of this procedure.

If the vehicle has the 6.6L engine, the fuel filter is located in the engine compartment on the driver side of the vehicle. If the vehicle has either the 7.2L or 7.8L engine, the fuel filters are located in the engine compartment on the driver side of the vehicle, and on the driver side frame rail in front of the fuel tank.

1. Apply the parking brake.



2. Unplug the water sensor wire connected to the fuel filter and unscrew the filter element.
3. Remove the filter element. If there is any dirt on the filter sealing surface, clean it off. Remove and reuse the water sensor float switch located on the bottom of the fuel filter.
4. Install the new filter element.
5. Reinstall and tighten the filter container and reconnect the water sensor wire to the filter.
6. Use the fuel filter priming procedure earlier in this section to prime the fuel filter.
7. Tighten the air bleed valve by turning it clockwise until hand-tight.
8. Start the engine and let it idle for five minutes. Check the fuel filter and air bleed valve for leaks.

The engine controller calculates when to change the fuel filter based on vehicle and fuel use. Whenever the fuel filter is changed, reset the fuel filter light so the engine controller can calculate when the next fuel filter change is required. If the fuel filter is ever changed prior to a change fuel filter light being turned on, reset the fuel filter change light.

To reset the Fuel Filter Change light:

1. Turn the ignition key to ON/RUN with the engine off
2. Fully press the accelerator and brake pedals at the same time for 10 seconds. If the Fuel Filter Change light flashes for 5 seconds, the system is resetting.
3. Turn the key to OFF.

If the Fuel Filter Change light comes back on when you start the vehicle, the light has not been reset. Repeat the procedure. See Change Fuel Filter Warning Light for more information.