The diesel filter element is used to filter out impurities and water in the fuel system, ensure the normal operation of the engine, reduce wear, prevent blockage and extend the service life of the engine. In theory, the frequency of draining water from the diesel engine filter element is once a day, but it still needs to be combined with the specific situation. If the vehicle is used more frequently, the drainage frequency will also increase accordingly.

Diesel filter drainage process
1. Park the vehicle on the flat ground, pull out the oil outlet pipe of the diesel filter element from the engine after the engine is stopped;
2. Close the diesel filter cover;
3. Open the exhaust port of the diesel filter element with a wrench to keep the internal and external pressure consistent;
4. Open the waterproof valve of the diesel filter element, and the water inside will flow out naturally;
5. After the water flow ends, close the exhaust port and cover of the diesel engine filter element, and connect the oil outlet pipe back to the engine.

In addition to regular drainage, the diesel filter must also be replaced regularly. If it is not replaced for a long time, the diesel filter will be blocked, which will cause some adverse effects, such as insufficient fuel supply, insufficient power of the vehicle, difficulty in starting, and even black smoke from the exhaust port, which will affect the working performance of the engine, increase fuel consumption, and shorten the service life of the engine.
The service life of diesel filters is mostly about 5000-1000km, but it depends on the actual situation. If you feel that the power is insufficient and it is difficult to start, you can check the filter. If the filter is dirty and cannot filter the impurities and water in the fuel system well, it needs to be replaced.

Replacement process
① Close the oil inlet ball valve and open the upper end cover. (The aluminum alloy upper end cover needs to be gently pried off from the side slot with a flat screwdriver)
② Unscrew the plug wire at the drain outlet and drain the dirty oil.
③ Lift up the fastening nut at the upper end of the filter element. The operator should wear oil-proof gloves to hold the filter element tightly and take down the old filter element vertically.
④ Replace the new filter element, pad the upper sealing ring (with original gasket at the lower end), and tighten the nut.
⑤ Tighten the drain plug, cover the upper end cover (pay attention to the gasket seal ring), and tighten the bolts.