I was at the park today with the kids when I looked up to watch an EMB-145 climbing out of Manchester on a Rwy06 departure. It was in a climbing right turn and I saw what looked to me like fuel venting out of the port wing,perhaps a third of the way along from the tip, trailing edge. Surely this would not be a usual occurance, was the aircraft in trouble, i.e. dumping for an immediate landing ?? Is the EMB-145 MLW much lower than its RTOW ?? Any ideas anyone??