Diesel filter drain:
1. Drain water under the diesel oil-water separator, unscrew the small cap under the filter, and close the oil inlet and outlet ports at both ends;
2. The function of the diesel filter is to filter out harmful impurities and moisture in the fuel system, protect the normal operation of the engine, reduce wear, avoid clogging, and increase the life of the engine;
3. The filter element of diesel filter mostly uses filter paper, and some are made of felt or polymer materials. The filter element of gasoline filter mostly uses filter paper, and some use nylon cloth or polymer materials;
4. The structure of the diesel filter is roughly the same as that of the oil filter, with replaceable and spin-on types.

The function of the diesel filter is to filter the impurities in the fuel of the automobile, so that the fuel supplied to the engine is more pure; as we all know, the quality of domestic gasoline is uneven, and the maintenance of the diesel filter cannot be ignored. The general gasoline filter needs to be replaced every 20,000 kilometers:
1. Disconnect the fuel pump fuse of the vehicle or disconnect the power supply of the vehicle to avoid the action of the fuel pump to pump out gasoline when the fuel pump is removed;
2. Remove the cushions of the rear seats and the cover plate on the oil pump;
3. Replace the new gasoline filter assembly with the corresponding parts on the old gasoline filter;
4. Apply petroleum jelly to lubricate the sealing rubber ring of the fuel pump to avoid leaking fuel or fuel gas due to inadequate sealing after the sealing rubber ring is twisted;
5. Install the fuel pump cable plug and the fuel pipe on the fuel pump to check whether there is leakage. If there is no leakage, install the seat, if there is leakage, reinstall the sealing rubber ring.