english 
The fuel tank, also known as the fuel storage device, requires high corrosion resistance. At dual working pressure, it should be sealed when the gauge pressure is at least 0.03MPa. The generated overpressure must be self reduced through holes or safety valves. Fuel should not flow out from the sealing cap or pressure balancing device when driving on bends, sloping roads, or under impact. The fuel tank must be installed away from the engine to avoid igniting the fuel in case of a traffic accident.
In addition to storing oil, the fuel tank also plays a role in dissipating heat, separating bubbles, and settling impurities in the hydraulic system. There are two types of fuel tanks: open fuel tanks and closed fuel tanks. Open type fuel tanks have a simple structure and are easy to install and maintain, and are commonly used in hydraulic systems; Closed fuel tanks are generally used for pressure fuel tanks.
A fuel tank generally has two outlets: one is the fuel filling port that we can directly see, and the other is the outlet used to install the fuel pump and fuel metering device.
The fuel tank is a relatively closed system, usually equipped with ventilation devices to prevent deformation due to the pressure difference between the tank and the atmosphere caused by excessive consumption of fuel. Early fuel tanks were mostly made of metal materials, but later synthetic materials were used to meet the requirements of lightweight and structural design.