DO NOT use the default FS9 fuel loading menu - you WILL experience unintended issues if you use it!

Our 747-400 includes an extremely realistic and complete simulation of the aircraft's complicated fuel system. In order to facillitate easy preflight use of the system, we've implemented a virtual fueling truck of sorts that will automatically balance the tanks correctly as well as set the fuel pump switches and crossovers on the overhead for whatever fuel load you enter in.

To access this system, open the PMDG/General/Fuel dialog and either enter a custom fuel value (you can use your mousewheel to increment or decrement the value faster) or choose one of the preselected values. Press OK and the fuel will immediately be loaded into your tanks.