The invention relates to a suction line (9) which is intended for use notably in an internal combustion engine and comprises a driven control element (15). The drive mechanism for the control element (15) is in turn driven by a fluidic, notably hydraulic, energy source which in comparison with the vacuum arising in the suction line presents a high energy density, so that the quantity of both material and space required for the drive mechanism can be kept low. To this end the drive mechanism can, for example, be connected to the power steering pump (26) of the motor vehicle. This results in virtually no extra cost as the components for providing energy in any event have to be accommodated in the engine compartment, which makes the proposed solution even more economical. In case of malfunction of the power steering pump (26) engine power is reduced provided a return spring (29) in the drive mechanism ensures the resetting of the control element.