Activated carbon canisters

Every fuel tank has a pressure balance pipe, which ensures that no vacuum develops as the tank is emptied, and that heating and expansion of the fuel does not create overpressure in the tank. The fuel fumes that escape when the overpressure is relieved are fed through a pipe to the activated carbon canister, where they are captured or stored. The fuel fumes stored in the filter are then burned during engine operation. Activated carbon canister modules thus reliably reduce the emission of hydrocarbons and pollutants.