english 
Excessive sediment in the fuel tank and a large amount of impurities entering the oil pipe can accelerate the clogging of the filter and wear of precision components, affecting the normal use of the engine. Therefore, it is essential to regularly remove sediment from the fuel tank and maintain its cleanliness.
1> Unscrew the oil tank drain plug, drain the remaining oil, and then install the drain plug.
2> Remove the fuel tank cap and filter, add fuel to the tank, with the fuel level about 15-20mm from the bottom of the tank.
3> Then connect the compressed air hose to the specially designed spray head. Spray nozzles are generally made of metal tubes with an outer diameter of 12mm and a length of about 250mm. One end is welded and blocked, and 4-5 small holes of 1mm are drilled. The other end is connected to a flexible hose.
4> Insert the hose with spray head into the bottom of the fuel tank.
5> Wrap cotton yarn with a clean cloth to seal the fuel inlet, turn on the compressed air switch, and maintain a pressure of 380-600 kPa for flushing. When rinsing, the position of the spray head should be frequently changed to allow sediment and adherents to turn over with the oil.
6> After flushing the oil tank with the spray head, immediately remove the drain plug and drain the dirty oil.
7> After cleaning the fuel tank, check the fuel filter screen for dirt or damage and dispose of it at any time.
8> Check if the fuel tank cap vent valve is unobstructed. If the valve spring has no elasticity or is corroded, it should be repaired or replaced.
9> Finally, fill up the fuel and remove any air from the oil circuit.