The car fuel cap (1) has a stirrup (2) on its inner side, into which a locking component (3) fits. A microswitch (4) releases this, allowing the cap to swivel into an open position.

The car fuel cap (1) swivels about an axis at right angles to the outer surface (10) of the car to open. It is opened automatically by a motor or spring (4).

The closure unit for fuel tank filler connections (10) of motor vehicles comprises at least two pivotable closure elements (1, 2) with inclined top surfaces (11, 21) for entry of a filler nozzle.