Abstract: A fuel-air-mixture-forming device for an internal combustion engine, has a nozzle body (2) of rotational symmetry which, together with a throttle body (7) of rotational symmetry which is displaceable in the nozzle body, forms a convergent-divergent nozzle (10) which debouches into an intake pipe of the internal combustion engine. A fuel air slot (11) surrounds the convergent-divergent nozzle and debouches via a circumferential slot opening (12) into the nozzle. Fuel mixed with air is injected from the slot opening into the nozzle via a direction approximately transverse to the direction of the main air mass flow (L). In order to obtain an equalization of the closing forces caused by the vacuum on the throttle body, in accordance with the invention, the throttle body has an inner space (27) which is closed off from the nozzle and is provided with at least one pressure equalization cutout (28) which connects the nozzle with the inner space.