Ok. I fixed it. The first thing I tried was putting that
pump in line. It was a
coolant auxiliary pump out of a caddy. Flow was very noticeable now . But it still overheated. It is as though the
heat exchanger isn't doing a good job. Maybe from rust. There's nothing clogging it. So I took the hose from the fresh
water pump and connected it where my factory
coolant pump is and took the line that used to supply the factory pump and ran that to where it cools the
exhaust.and exits out the side of the
boat. And now it works fine. I use my
boat on a lake it's no longer a closed loop system. And works like a charm