I don't have the program but I will try to help. There should be a menu to set your required fuel. If not, go to the aircraft menu within Flight Simulator and change fuel to what you need. You will get the ATC IFR Clearance on the Clearance frequency,if given, or Ground control frequency. This will give your Clearance limit (normally your destination)route of flight,Initial altitude, Departure control frequency and transponder code.
C
R
A
F
T
If you pull up close to the pump and set your Parking brake, this will fill your tanks.