Prepay is similar to money preset, but with several important distinctions. First, the grade option is selected. This action may be activated regardless of the state of the fueling point.
Fueling point 1 is now prepaid. If the nozzle of non-matching grade is lifted, the state is Calling and dispensing does not start.
The wrong nozzle replaced, correct nozzle lifted, and dispensing starts until preset money is exceeded (or nozzle is manually replaced before that).
