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Repairing Water Tank on 65 Hatteras Sportfish

Old 06-30-2020, 10:44 AM
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Default Repairing Water Tank on 65 Hatteras Sportfish

I have a 1988 Hatteras Sportfish that has a 400 Gallon water tank, that leaks, it has baffles in so I can't put a liner in it. There is no excess to it other than a small section at the top. I am looking to see if anyone has any ideas on what I could do to repair the tank.
Old 06-30-2020, 10:54 AM
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That's about 55 cubic feet of tank to cut up in small pieces and remove. IF you were to find THE leak, I'm sure there are more.
Old 06-30-2020, 11:08 AM
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I am sure there are several small leaks I just have to figure out a cost effective way to handle
Old 06-30-2020, 12:42 PM
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Originally Posted by Destiny7240 View Post
I am sure there are several small leaks I just have to figure out a cost effective way to handle

Start cutting the tank up in to manageable size pieces.

"You eat an elephant, one bite at a time"
Old 06-30-2020, 01:12 PM
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What material is the tank made of? Is it safe to assume you do not want to replace it?

Is any of the tank visible?
Old 06-30-2020, 01:19 PM
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The tank is made out of fiberglass, it is visible through a 3 ft by 3 ft hatch in the galley way. You are correct I really want to avoid replacing because I would not be able to get a similar size back in and I would end up having to cut a lot of my floor up to do so
Old 06-30-2020, 04:08 PM
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ask this on sams marine site, you will probably get a lot of answers... dont cut it out, hatteras made good tanks. where is the leak? top bottom? when hatteras made the tanks they are molded into the boat structure, baffles added then the lid if machine screwed into the baffles and glassed all of the way around and over the machine screws. if the leak ios at the top someone probably fill it too fast and pulled the machine screws thru the lid cousing the leak and also the lid will bulge when the tank is filled to the top
Old 06-30-2020, 04:33 PM
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If you are doing glass work on a drinking water tank, make sure to use FDA approved resin for potable water.
Old 07-01-2020, 04:10 AM
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All I can tell is it is leaking, I am assuming it has a leak close to the bottom because when I leave it, it will hold only about a quarter of a tank.
Old 07-01-2020, 04:44 AM
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Call Hatteras and get the dimensions. What do you have for flooring? You’re going to have to open it up to repair it so plan on cutting up the floor. Most of the ones that we worked on were 3/4” plywood. You might get lucky and cut a small hole in the floor to find/patch the leak and install an inspection plate to repair hole in the floor.
Old 07-01-2020, 05:19 AM
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I have 3/4 inch plywood as well, thank you for your input
Old Yesterday, 09:59 AM
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Cut the tank up and replace with 2 smaller aluminum tanks you can drop in and plumb them together in your access hatch.
Old Yesterday, 10:04 AM
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Fiberglass makes great tanks, if done well they rarely have problems and the quality of water (or fuel if you use the correct resins ) is better than that in aluminum tanks.
Find a mechanic that's skilled enough to determine what the problem is and have it fixed.
Gerald

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