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DIESEL FUEL TANK LEAK

Discussion in 'Carver Yacht' started by MIKE MICHAELS, May 17, 2019 at 7:56 AM.

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  1. MIKE MICHAELS

    MIKE MICHAELS New Member

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    Hello folks , I own a 1995 Carver 440 Aft cabin, just recently my starboard tank started leaking bad, I think they are aluminum tanks, anyway to replace this tank it will cost around $25,000 do to the location and accessibility, I did get to transfer fuel to the port side, anyway i used 2 50 gallon trash cans with water in them to balance the boat. So here is my question, how can I run both my 318 Cummins Diesels off just one tank? It doesn't appear i have any lines or valves to turn to allow this. The only line is the fuel transfer with a small pump that runs from one side to the other.. Please Help!!
  2. Capt J

    Capt J Senior Member

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    Some boats you can run both motors off of one side, but the boat has to have the valves in order to do so. I'm guessing yours probably does not and one engine draws and returns to one tank, and the other draws and returns to the other tank. If you replace the tank, plan on doing both tanks as the port tank most likely is not far behind the starboard tank. No way to repair existing tank, it will just leak again.
  3. MIKE MICHAELS

    MIKE MICHAELS New Member

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    i have been in contact with a company in Florida that offers military grade fuel bladders, you install in the existing tank for around $2500.00 . And i dont believe Ins. will pay for any of this so I really want to be able to run both engines off 1 tank first, till I can bank some money.
  4. Pascal

    Pascal Senior Member

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    Why woudl insurance pay for tanks on a 25 year old boat? Aluminum tanks in mass production boats often fail earlier than that, unfortunately

    Marine tanks have baffles in them to prevent fuel from sloshing around in rough waters so you can’t put bladders in them

    If you want to run one tank you will have run feed hose from the transfer pick up to your engine, assuming the pick up tube is low enough. Then you need to run a new hose from the engine to the tank for return. Teeing into the other engine hoses is unlikely to work as they are probably too small to support both engines.

    $25000 sounds like a lot of money, even if an engine has to come out to get to the tank.
  5. Capt Fred

    Capt Fred Senior Member

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    You can get someone to add the necessary fuel lines and valves to run both engines off one tank. This is a nice option to have as a back up solution for many fuel issues. As Capt J states you have to plumb both the supply and return lines. I would recommend you get a professional to do the work. Running both engines off one tank will continually create a balance problem plus you will be carrying extra weight for balance. I second what Capt J said about the other tank, it may be ready to give way. There are bilge sensors to detect oil in the bilge water to prevent overboard discharge.
  6. MIKE MICHAELS

    MIKE MICHAELS New Member

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    I have had 3 contractors come look at my situation, the reason for the large cost is because to get the tanks out they need to cut a hole in the side of the boat to remove it, which is cheaper than taking up the floor and removing the bridge. Capt. Fred i will get a pro to do this, i plan on putting a cheap bladder in the bad tank to hold water for balance, and a pump to level when needed. It amazes me the design of these saddle tanks and the poor accessibility to them, i had to remove the exhaust to find the leak. Break Out Another Thousand +
  7. MIKE MICHAELS

    MIKE MICHAELS New Member

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    Capt. Pascal the baffles would also be cut out in order to put a bladder in it, i have already been in contact with Carver about this, thanks guys for your quick response.
  8. Capt J

    Capt J Senior Member

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    And what is the point of spending any money to put a water bladder in a bad fuel tank??? The other fuel tank isn't going to be in any better condition and the pickup in 1 tank isn't large enough to supply both engines. The boat will always list depending on how much fuel you add or use from the port tank. Why couldn't you remove the floor and take the tank right out of the salon door and put it in that way? I've seen the old tanks cut out and a couple of the same size tanks but shorter put in and linked together. Their has to be a much easier way to do the job properly.
  9. PacBlue

    PacBlue Senior Member

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    A repair like you propose makes the resale value drop to almost nothing. That may or may not matter for your circumstances, but something to consider.
    Water ballast is an empty solution, an inverter solution with more batteries are better than fluid ballast and better for resale.
    Keep on looking for contractors who can offer a better solution.
  10. Capt Ralph

    Capt Ralph Senior Member

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    Your insurance company may not appreciate non factory fuel mods also.
  11. Capt Ralph

    Capt Ralph Senior Member

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    Huckins Yacht just did the same job on a 40+ Maxum for $13k including tanks.
  12. Pascal

    Pascal Senior Member

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    So you d have to cut the top of the tanks, somehow be able to reach inside to cut the baffles. Then put some material to protect the bladders from getting damaged by the rough edges.

    Have you considered cutting out the old tank and see if you could fit two or even three smaller tanks in that same space? Could save you the costs of the massive surgery.
  13. Capt J

    Capt J Senior Member

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    Which is what I guess this job would cost at the right yard. $15k or less for both tanks.

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