Is there any harm in not filling up the gas tank completely?

[VanElle]

There is no harm in not filling up the gas tank completely; in fact, filling it up can be detrimental and may cause the following hazards: Fuel leakage leading to waste and safety risks: Gasoline storage at gas stations is very strict, especially during hot summers, so gasoline is stored underground where temperatures are kept very low. If a car's gas tank is filled to the brim, gasoline may overflow from the vent hole, which not only wastes fuel but also poses a fire hazard if the spilled gasoline comes into contact with an open flame. Gasoline evaporation causing unpleasant odors and carcinogenic effects: The activated carbon canister is usually located near the fresh air intake for the exterior circulation. When the tank is overfilled, the carbon canister becomes saturated, and excessive pressure may cause it to release pressure and exhaust, allowing air containing gasoline components to enter the cabin, affecting the health and safety of the driver and passengers. Damage to the carbon canister: The carbon canister is typically installed between the fuel tank and the engine. Since gasoline is a volatile liquid, the fuel tank often contains vapors at room temperature. The fuel evaporation emission control system is designed to direct these vapors into the combustion process and prevent them from evaporating into the atmosphere. The activated carbon canister storage device plays a crucial role in this process. If the tank is overfilled, liquid gasoline instead of gasoline vapor enters the carbon canister, which can cause damage to it.