A flow meter includes a rotor housing having an inlet, an outlet, and a bore extending axially through the housing from the inlet to the outlet, and a screw spindle arrangement including at least two rotary helical worm bodies which are disposed in the bore and which engage in a form fit manner within one another. A pulse generator is mounted on one of the worm bodies and triggers electrical pulses in the mating measuring transducer which are dependent upon the rotational speed of the worm body. The measuring transducer has a pulse-adjusting and pulse-shaping stage which adjusts the magnitude and/or frequency of the pulses relative to a volumetric flow rate of fuel to the bore. An electric counting mechanism receives the electric pulses from the pulse-adjusting and pulse-shaping stage and typically transmits these pulses to a display unit for display.