A charcoal canister, also known as Evaporation Emission Control System, is a container filled with activated charcoal used to trap gasoline vapor from the fuel tank and carburetor while the engine is off.
- It ensures that harmful gases from the gas tank can't generate pollution by absorbing fuel vapor that would vent into the atmosphere. The canister's valve allows trapped vapors back into the engine, which will be burned to power the engine during operation.
- A defective charcoal canister may result in a low fuel economy. It means that the vehicle will waste gasoline rather than use it efficiently.