What are the consequences of overfilling the fuel tank?

[DiLucy]

Due to thermal expansion and contraction, in hot summer days, if the tank is overfilled, fuel is highly likely to overflow from the vent hole. Once exposed to an open flame, it can easily cause a fire, and in severe cases, even lead to an explosion. The specific details are as follows: 1. Blocking the vent hole: Overfilling the tank can easily block the vent hole. Once the vent hole is blocked, negative pressure will form inside the fuel tank, leading to poor fuel supply or even a complete halt in fuel delivery. Additionally, overfilling can also harm the charcoal canister. The charcoal canister is usually installed between the fuel tank and the engine. Gasoline is a volatile liquid, and under normal temperatures, vapors often exist inside the fuel tank. 2. Evaporative emission control system: The function of the evaporative emission control system is to direct the vapors into combustion and prevent them from evaporating into the atmosphere. During this process, the activated charcoal canister storage device plays a role. If the tank is overfilled, liquid gasoline instead of vapors will enter the charcoal canister, causing damage to it.