Motor vehicle comprising an injector rail and an injector

The engine has an injector rail (6), injectors (8) and an ultrasonic wave generator (10). The generator produces ultrasonic waves that are transmitted to a membrane and to fuel filled in the rail. Each of the injectors is in fuel communication with the inner side of the rail. The waves propagate through the fuel to inner side of each injector up to an injection nozzle, for cleaning the nozzle. An independent claim is also included for a method of cleaning an injector of an engine.