During the rainy season, there is a large temperature difference between day and night. How do farmer friends maintain their own farm machinery? When the agricultural engine is working during the daytime, with the consumption of fuel, a negative pressure is formed in the fuel tank, and hot and humid air enters the fuel tank from the compound valve of the fuel tank cap; after night shutdown, the temperature drops rapidly, and the hot air entering the fuel tank is cooled accordingly. Water vapour saturates easily, and when it encounters a colder tank wall, it adheres to the wall to congeal the water droplets. In this way, the day and night alternately reciprocate, and the moisture in the tank increases.
In order to avoid or reduce the accumulation of water in the tank, in the season when the air humidity is high and the temperature difference between day and night is large, the fuel in the fuel tank should be filled up at night, and the wet air does not come into contact with the tank wall, and it is naturally difficult to form water droplets. In addition, the maintenance should be strengthened, and the accumulated water in the sedimentation cup in the filter should be promptly dumped to remove the rust stains and the like in the fuel tank and the filter.