In normal refueling, we see that when the fuel dispenser is refueling, the fuel gun will stop immediately when the set fuel charge arrives. Many car owners believe that there are not a few owners who have such doubts in the fuel pipe of the fuel gun. In this regard, Sinopec has brought several cold knowledge about gas stations on its official platform. < / P > < p > 1. The fuel filling pipe is so long, is it that the oil enters the pipe from the fuel dispenser as soon as the oil gun switch is pressed? Is there a tube left in my car after refueling? Can it flow out with a flick? < / P > < p > in fact, the oil gun in the gas station is transported to the oil gun through the oil pump. After each refueling, the one-way valve in the oil gun will be closed, and the oil will not return to the fuel dispenser. At this time, no matter how you swing the oil gun, the oil in the oil pipe will not leak out. < / P > < p > moreover, due to the oil pump, the oil pipe is always full of oil. Even if you have just finished filling, the next car can also use the oil gun to refuel immediately without any waiting. < p > < p > therefore, drivers don’t have to worry. The gas station has deducted the oil in the oil pipe, and how much oil you add has been added into the fuel tank. < p > < p > in fact, we can see a tank truck as a whole, which has a sub warehouse structure. That is to separate the oil tank into two or more tanks, and after the separation, the oil tank can be loaded with different grades of oil in different warehouses. < / P > < p > the answer is of course not. The oil in the fuel dispenser is held by a valve. Although the tanker is full of oil, there are many valves at each joint to prevent oil leakage. < / P > < p > for example, some careless drivers did not see the refueling status and drove away. And then, with the fuel gun, we pulled the tanker to. The connection of the oil gun oil pipe is equipped with a pull-off valve, which will block the fuel dispenser in time, so that the oil of the fuel dispenser will not leak on the ground. Didi Qingju bicycle has entered 150 cities