So, I don´t hsve to touch the EFB loading command? But I must do it for the Fuel.
You must do it for the Fuel, because there's no other way to Refuel the Fenix, but the passenger simulation in the Fenix is not something GSX can read, since (opposite to the fuel) there's no standard variable for those, so GSX cannot detect anything, like it does with the Fuel.
Of course, if you use Simbrief, both GSX and the Fenix will show to the correct passenger number, as planned.