The same thing happens, my procedures are starting with the airplane ready to take off with 3 tanks, I start the takeoff race with the CL switches and pylons OFF, I take off and I enter the landing gear, immediately after activating the switch pylons, leaving OFF the CL switch, I fly for a while and when the alarm goes off that the tank is empty under the Pylon, switch to OFF and raise the CL switch to ON, I immediately jump the alarm that it is also empty, check the fuel gauge and keep going down without showing signs that he was receiving fuel from the CL tank, it would just happen to me ?? I do exactly as the manual says :(