NSEU,
As far as I am and the MD-11 (or any other aircraft ) is concerned: Because it is part of the fuel sytem, because it is a panel on my airplane with controls/indicators what is nice to now ( at least at basic level), because sometime somwhere at a remote airport I will have to assist with refueling, ... etc.
This kind of thinking was adopted when Boeing and MD compiled their 737/MD-80 manuals with a short description/drawing of the refueling panel.