The process of draining water from truck diesel filter is relatively simple
The specific steps are: 
1. Park the car on a flat and hard road, pull out the oil outlet pipe of the diesel filter element from the engine after the flame is turned off
2. Close the cover of the diesel filter element
3. Use a wrench to open the exhaust port of the diesel filter element to keep the internal and external air pressure consistent
4. Open the blue drain valve of the diesel filter element to allow the water inside to flow out naturally
5. After the water flows out, close the exhaust port and cover of the diesel filter element, and then connect the oil outlet pipe to the engine. The whole process is complete

The role of diesel filter in trucks:
1. Filter impurities and moisture in the fuel system
2. Lubricate engine parts to reduce wear
3. Clean engine parts to prevent blockage of oil pipeline
4. To a certain extent, it can extend the service life of the engine

Matters needing attention on diesel fuel filter for trucks:
1. The diesel filter element must be cleaned every 3000-5000 kilometers of the truck, and replaced every 8000 kilometers
2. When replacing the diesel filter element, it is best to replace the original filter element to prevent problems due to mismatch