Diesel fuel tank leak

Discussion in 'Sport Yachts/Yachts' started by Risingson, Jun 26, 2022.

  1. Risingson

    Risingson Active Member

    154
    Jun 12, 2020
    Cos cob ct
    1999 410 express 3116’s
    Cat 3116 350 hp
    Looks like I have a pin hold leak in my starboard tank. Found a little fuel dripping from under the tank. Going to be a big problem I would assume. Any ideas?
     
  2. The Bill Collector

    The Bill Collector Well-Known Member GOLD Sponsor

    Jun 2, 2008
    Tacoma, WA
    1998 450 Sundancer, Achilles dinghy w/15hp
    3126 Cat's
    Following
     
  3. Maybe A Dancer

    Maybe A Dancer Became a Dancer 12/23/21 GOLD Sponsor

    543
    Aug 20, 2021
    Florida West Coast
    Started out as MAYBE A DANCER
    Became a Dancer - 12/23/21
    450 DA Sundancer running CAT 3126
    Many years ago I learned a TEMPORARY FIX from my father.

    Find the spot and rub a bar of FELS NAPTHA SOAP into the area.

    NOT A PERMANENT FIX, but it may hold it while you determine your next step.

    BEST !

    RWS
     
  4. fwebster

    fwebster Well-Known Member TECHNICAL Contributor PLATINUM Sponsor

    Oct 6, 2006
    Middle Tennessee ; Panama City Beach, FL
    1996 450DA
    3116 Caterpillars
    i'"Looks like I have a pin hold leak in my starboard tank. Found a little fuel dripping from under the tank. Going to be a big problem I would assume. Any ideas?"

    I've see fuel tanks replaced on 410DA's and on 450DA's. It is an expensiove and time consuming task on both. The cause is usually moisture from leaks in the deck plate O-ring seal or condensation in the tanks from failing to leave the tanks full in the off season.

    The tanks in the Sea Ray Sport Yachts were made and on labor and tank cost.furnished by Florida Marine Tanks. They still have the drawinmgs and specs for the tanks and t hey will still make replacement tanks. This is kind of a slam dunk because their tanks fit exactly and have all the correct fittings on them. The problem is they used to treat Sea ray owners very well on pricing but when Sea Ray closed the yacht divisions it hurt prime vendors like Florida Marine Tanks so pricing reflects that.

    On a 410EC I suspect you will need to pull both engines and transmissions and perhaps the cockpit deck so you can expect several days in a boat yard plus 2 men for about 40 hours each coming out and close to the same going back in. This is going to be expensive unless you get some help on pricing from your yard and service center.

    Sorry, but there are very few short cuts possible on a fuel tanks replacement of this size.
     
  5. Riptide III

    Riptide III Well-Known Member

    Dec 8, 2007
    Dartmouth MA
    1997 Sea Ray 400DA
    Cat 3116 TA
    1994 Sea Ray Laguna CC 250 Tohatsu
    :
    Run off one tank for the rest of the season. When I replaced mine I had the new one made 1” smaller. I was glad I did because sliding it in was a pain in the butt
     
  6. Risingson

    Risingson Active Member

    154
    Jun 12, 2020
    Cos cob ct
    1999 410 express 3116’s
    Cat 3116 350 hp
    Thanks Frank …uhh I’m disgusted. I was hopeful
    For a sealant that could be placed in the tank somehow. tanks have always been full for storage and never have had any water intrusion.
    Riptide did you have to remove the engine and floor?
     
  7. Njlarry

    Njlarry Active Member

    436
    May 9, 2021
    Chesapeake bay
    2000 400 DB
    Cat 3126
    Sorry to hear. Because metal tanks corrode you could consider semi custom rotomolded tanks from Ronco Marine Tanks. They come in many sizes and place whatever fittings you want wherever you want. Their pricing is very good and will never corrode. You could connect two smaller tanks or have a straight in fill hose to permit use of a fill dip stick. The did the holding tank replacement on my sailboat and shipping was very fast.
    Firms that remove old home heating oil tanks by cutting them up might be able to do the same for yours.
    Good luck.
     
  8. mrsrobinson

    mrsrobinson Well-Known Member SILVER Sponsor

    Mar 9, 2006
    Virginia, USA
    2001 Sea Ray 380DA
    3126 purring CATs
    The starboard tank on mine was replaced by the PO for the same reason. I can pull the invoice for you and send a copy if you'd like. The starboard engine had to come out.
     
  9. mrsrobinson

    mrsrobinson Well-Known Member SILVER Sponsor

    Mar 9, 2006
    Virginia, USA
    2001 Sea Ray 380DA
    3126 purring CATs
    I found the invoices. One for removal, one for install. The shop had to remove the starboard engine, generator and prop so they could slide the shaft back. This is a V-Drive boat. Total cost of repair, with repairing the tank, was $7000. They also pumped out the fuel. These were estimates, not sure these are the final invoices as they are not stamped paid. I don't see a line item for the welding repair either.
     
  10. Risingson

    Risingson Active Member

    154
    Jun 12, 2020
    Cos cob ct
    1999 410 express 3116’s
    Cat 3116 350 hp
    Oh wow thank for info
     
  11. Shoyrtt

    Shoyrtt Alamitos to Avalon SILVER Sponsor

    Jul 16, 2020
    Redlands, CA
    1999 450 Express Bridge, 9’ Achilles dinghy w/15hp Suzuki EFI
    Caterpillar 3126TA
    Have you been able to determine the location of the leak? Sea Ray didn't do us any favors gaining access to the tanks, but there is a possibility that your leak could be from a hose or fitting on the top of the tank and the drip you see is coming from there. Another thought is if it is a pinhole leak in the tank itself that you can locate, drain the tank and try some JB Weld. You might get lucky.
    JBWeld.jpg
     
  12. Risingson

    Risingson Active Member

    154
    Jun 12, 2020
    Cos cob ct
    1999 410 express 3116’s
    Cat 3116 350 hp
    Cannot find the leak on parts of the tank which I have access to. I always go out with full tanks. I’m going to run the tank
    down and see if the leak stops at some point. May give me an idea of where to look. Also will recheck all the fitting but saw nothing when I did a quick look.
     
  13. Riptide III

    Riptide III Well-Known Member

    Dec 8, 2007
    Dartmouth MA
    1997 Sea Ray 400DA
    Cat 3116 TA
    1994 Sea Ray Laguna CC 250 Tohatsu
    :
    As I have a sundancer not an express mine will be different, however, yes I had to remove engine, batteries, Vacu flush, prop, I would not repair the tank if you remove it. Way to much work to chance it on a 22 year old tank. I think I paid $2000 for a custom to my specs. Might have been less I could look it up. Could it be a vent hose Or fill clamp?
     
  14. mrsrobinson

    mrsrobinson Well-Known Member SILVER Sponsor

    Mar 9, 2006
    Virginia, USA
    2001 Sea Ray 380DA
    3126 purring CATs
    Are you sure it's the tank? I ask because the fuel primer pump on that side of the engine was leaking on mine and I thought it might be the tank again. After a fill up and cruising for about an hour I could smell diesel on that side of the engine compartment and see a damp bilge. Narrowed it down to the fuel primer pump, which I replaced this past weekend.
     
    Last edited: Jun 29, 2022
    carterchapman and Riptide III like this.
  15. Risingson

    Risingson Active Member

    154
    Jun 12, 2020
    Cos cob ct
    1999 410 express 3116’s
    Cat 3116 350 hp
    The fuel is coming from the port side of the tank and traveling to the stern by the vac flush holding tank.
     

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