What are the hazards of overfilling fuel?

[ThomasDella]

The hazards of overfilling fuel include: 1. Fuel leakage: Gasoline at gas stations is stored underground where temperatures are lower. Especially in summer, due to thermal expansion, overfilling may cause fuel to overflow from the vent hole, which can easily lead to fires or even explosions; 2. Clogging the vent hole: If the vent hole is blocked, negative pressure will form in the fuel tank, causing poor fuel supply. A car failing to start immediately after refueling might be due to an overfilled fuel tank; 3. Damage to the charcoal canister: The charcoal canister is installed between the fuel tank and the engine. Since gasoline is a volatile liquid, the fuel tank often contains vapor at room temperature. Overfilling can damage the charcoal canister; 4. Gasoline vapor can be carcinogenic: The charcoal canister is close to the external circulation air intake. When the fuel tank is overfilled, the charcoal canister becomes saturated, and excessive pressure causes pressure relief and exhaust. Air containing gasoline components enters the passenger compartment, which can harm passengers' health over time.