During the refueling process, the jump gun is a normal phenomenon, and sometimes the gun can be repeatedly shot. When the fuel tank is filling up, the gun will jump automatically to prevent oil from spilling out of the tank. This is a normal protective measure.
According to the state technical supervision bureau, the oil quantity of the fuel oil can not be less than 5 liters per minute, not more than 60 litres. When the fuel gun is maintained, it will not affect the metering of the oil.
The frequency of the gun is also related to the design of the fuel tank. The filling is thin and long, and has a curve, the frequency of jumping gun is high. The nozzle is large and short, and the frequency of jumping gun is low.