I just bought an old 1970-60 model Renken 16 foot fiberglass boat. The ext. of the boat is in great condition, the inside is another story. It has been patched a few times and there is not a biliage pump for under the floor. There looks to be a hole in back of the boat where a pump line is to go. The owner befor had plugged the hole. I unplugged the hole last night and got a 30 gallons of water out. Do you think the water has damaged the boat under the floor, and should there be a pump for under the floor?