I just got 86 seafarer inboard i/o,went to winterize the other day.took the outside plug out so the bilge could drain..looked in bilge,there is a stringer separating the front and it had a plug in it..I took the plug out,and a ton of water drained out of the stern..The front bilge pump may not have been on...I does not make sense to me,if I leave that plug out ,all the water would drain to the rear and pump out..What is the purpose of keeping it separate?????