What are the consequences of overfilling the fuel tank?

[BradyMarie]

There are four consequences of overfilling the fuel tank, which are: 1. Fuel leakage: Gasoline at gas stations is stored underground where temperatures are lower. Especially during hot summers, due to thermal expansion, if the tank is filled too much, fuel may overflow from the vent hole, increasing the risk of fire. 2. Clogging the vehicle's vent hole: Once the vent hole is blocked, negative pressure will form inside the fuel tank, leading to poor fuel supply. 3. Damage to the vehicle's charcoal canister: The charcoal canister is usually located between the fuel tank and the engine. Since gasoline is a volatile liquid, the fuel tank often contains vapor at room temperature. The fuel evaporation emission control system directs these vapors into the combustion process to prevent them from escaping into the atmosphere. The activated charcoal canister plays a crucial role in this process. If the tank is overfilled, liquid gasoline instead of vapor may enter the canister, causing damage. 4. Carcinogenic gasoline vapor: The activated charcoal canister is typically located near the fresh air intake for the cabin. Overfilling the tank can cause gasoline vapors to enter the cabin, posing health risks to passengers.