I submitted this question in the "mid-size" forum and was advised to search for answers here. Can anyone here offer some insight as to what is involved and what to expect? The fresh water holding tank seems to be leaking from bottom. The boat is a '80. Is this usual? -------------- This was a big suprise. Boat all set for launch, filled up the water holding tank. A 1/2 hour later my bilge pump started running every 10 minutes... I looked under the port side bench in the main cabin, and there was a stream running from under the tank. I observed the three hoses attached to the tank and could see that the leak was not coming from a loose fitting. I assume that I have a fairly major project ahead of me, and that I should postpone my launch date (I am on a mooring). Can anyone here offer some insight as to what is involved and what to expect? It looks like I will have to cut the existing tank out, and retrofit a smaller one that will fit between the openings above the existing storage area that holds the tank. And I thought I was going to have an easy spring... :-(