1. Unscrew the fuel filler cap (to relieve pressure in the tank).
2. Disconnect water sensor connector and fuel line heater connector (in the presence of).
3. Disconnect the fuel lines and remove the fuel filter assembly with bracket.
4. Clean the water sensor.
5. Using an oil filter wrench, unscrew the housing and replace the filter element.
6. Re-establish all connections and bleed air from fuel lines (see below).