An angle-measurement device comprising at least one first tracer and one second tracer wherein the tracers are disposed on a common backing and are divided from one another by a separation groove. Said fuel supply device has a regulating device comprising a first regulator, which is provided with at least one integral part and which produces, in a first mode of operation, a regulating signal for a volume flow control valve, and a second regulator that produces a regulating signal for an electromechanical pressure regulator in a second mode of operation. The first limiting face is a base plate, the second limiting face is a right-hand guide segment and the third limiting face is a left-hand guide segment. Thus, there are two motors for rotating the two augers. Zero power consumption from the back-up energy source is achieved in the presence of an alternative higher voltage source.