alcohol evaporation or adding water to gasoline.

There may be the following reasons:

1. Actually, it is inevitable that there is water in the fuel tank, because when we are driving to refuel, we have to open the fuel tank cover to refuel, but at this time, empty gas will be mixed into the fuel tank.

2. Of course, it is not excluded that some unscrupulous merchants add oil-water mixed solvents to the fuel to temporarily mix oil and water.

3. And ethanol gasoline. At a certain temperature, when alcohol evaporates, water will be separated. Generally speaking, the longer the car drives, the more obvious the water in the tank.