An electronic device includes an adjustable mechanism disposed at a front end of a housing body thereof. For injection of fuel in a full-load operating state of the internal combustion engine, a first selection is made from the at least one first injector and the at least one second injector having a first metering range, including a full-load injection quantity required for the full-load operating state. The valve element is biased to abut a discharge valve seat in a closed position about an upstream end of an outlet passage.