Another quirk of refueling the rear tank of the AS355 series is that it is hard to comunicate visually with the pilot with the helicopter running. When operating the nozzle you have to stretch forward and then can only just see the pilot through the flap door window, or the back part of the window in a sliding door, which ever is installed. When you are looking at the pilot you cannot see the filler, so hopefully the pilot will signal to stop before you look back and see fuel gushing out of the filler. A headset connected with the intercom, or another person makes it easier for the refueller.
The front tank is a lot better.