I guess the above diagram is correct, though I'm not sure what airframe it is. Typically you see main tanks in the wings. externals are usually pods hung below the wings. Aux tanks can be just about anywhere else.
There is also an internal fuel tank that can be on or offloaded to carry additional fuel, but those don't see much use anymore. The ones we used in the Navy were specifically for carry fuel as the cargo. The tank is plumbed into the aircraft fuel system.