The limit values laid down in the legal regulations apply not only to exhaust gases but also to unburned hydrocarbons. This is why fuel vapours are collected in the activated carbon filter (ACF). In 2018, Pierburg was the first manufacturer in the world to launch an electric ACF pump that feeds the fuel vapours from the activated carbon filter back into the combustion process without the need for a vacuum from the intake manifold. MotorService provides this ACF pump in the aftermarket.