Using P3Dv4, it seems I have changed a setting somewhere, and now my aircraft take fuel from one tank entirely, rather than from all. Does that make sense?
Like right now, in another window I'm making a flight in the default FSX 737. I set the fuel prior to takeoff, but tank one drained completely, and engine one shut down. Is there something I can do to get it back to drawing fuel from all tanks evenly?