I have a 2002 57' Carver 570. We recently bought it and are living on it here in DC. The boat sat a while so I am going through the old diesel syndrome etc. I had a great idea to top off the water in the tanks, put some chemical in them to kill anything that lived that was bad for my body and then decided to just use the water in the tanks to ensure they worked fine. They worked fine for about a week, water flowed, water heater works great etc., then one day I get yelled at by my lovely wife because the water stopped flowing. I am also learning that everything that goes wrong on the boat somehow I initially caused it. I hooked up the marina water and the water flows fine now. So I figure all is fixed and unhooked to continue using the tank water. It worked for one day and the water stopped flowing again. This time it was my fault because the wife was perfectly fine keeping the water hooked to the pier. My thought is I need to figure out why it stops flowing when its not hooked to shore water and only on tank. No tripped breaker and all switches are on.

Thoughts?