I did a cleaning/checking operation on the fuel pump. Nothing seems to be clogged or damaged. There was dirt in the base, but nothing out of normal.
The engine now starts well, most of the times. But when riding, the bike looses the notion of ralenti and turns off. If I turn the switch or restart the system with the STOP ENGINE Button, the bike returns to normal, apparently.
I think I have to send her to a scan in a KTM autorized service.