Unscrew the fastening bolt (1), carefully pull the lower part of the filter (3) downwards and put it away.
Remove the filter element (6).
Remove the pressure spring with plate (5) from the mounting bolt and remove the bolt from the bottom of the filter.
Wash the bottom of the filter with gasoline and blow it out completely with compressed air, if available.
Check the quality of the sealing ring (2) for the central bolt and replace if necessary.
Place the pressure spring with the spring plate (5) on the fastening bolt.
Place a new rubber sealing ring on the bottom of the filter and insert the new filter element.
Tighten the bolt to 35 Nm.