What is the purpose of an automotive carbon canister?

[StMarley]

The functions of an automotive carbon canister are as follows: 1. There are two main purposes for installing a carbon canister in a car: one is environmental protection, and the other is energy saving. 2. Relying on the adsorption characteristics of activated carbon, the carbon canister stores excess fuel vapor from the fuel tank and reintroduces it into the engine for combustion when the engine is running. 3. To maintain a reasonable pressure range in the car's fuel tank. If the fuel tank pressure is too high, it may cause the fuel cap to become difficult to open, and in the event of a collision, it could be very dangerous. If the pressure is too low, some fuel vapor may evaporate, leading to waste—hence the need for a carbon canister. 4. The carbon canister prevents fuel vapor from being emitted into the air, avoiding gasoline waste, and also has a positive impact on environmental protection.