Waste Tank Leaking at Bottom

Discussion in 'General Maintenance/Repair Questions' started by BirdieNumNum, Sep 12, 2019 at 7:34 AM.

  1. BirdieNumNum

    BirdieNumNum Member

    33
    Mar 16, 2019
    310 Sundancer 2000
    Twin 5.7 Mercruisers w/Bravo III Drives
    2000 319 w/5.7/B3s. The bottom of my waste holding tank is leaking. The waste mechanic and I looked at it yesterday. It is definitely coming from the bottom, not the top. The next step is to remove the waste tank, which I don't think will be too difficult. I called Sealand/Dometic and they said there have been issues with the bottom cracking at the fasteners. I called Environmental Marine Services in FL and they said I need to send pictures of the holding tank and Sealand/Dometic will have to make a new one because that model is not in production anymore. The leak is getting worse. Am I on the right track?
     
    stephens013 likes this.
  2. Stee6043

    Stee6043 Well-Known Member

    Jun 1, 2015
    West Michigan
    1997 Sundancer 400
    7.4L Gassers
    Sounds spendy if you are considering a custom tank?? Can you find a closest equivalent that is stocked someplace? I've also heard mentioned on this site some kind of insert that can be used instead of replacing the tank. I'm not an expert but perhaps a little more internet searching could save you some boat bucks.
     
    Zim likes this.
  3. stephens013

    stephens013 Active Member

    247
    Oct 8, 2009
    Ft Walton Beach, Fl
    2001 510 Sundancer
    1997 400DA Sundancer
    3196 Cat; 660 PHP
    3116 Cat; 340 PHP
    I'ld start calling local surplus boat dealers. There are lots of boats out there. Seems only reasonable one would have a tank fitting your application with just a bit of modifications. Find some boat repair guy that's good at making things work. See what he comes up with.
    As Stee6043 pointed out; custom anything is pricey. And usually takes a lot of time.
    Good luck
     
  4. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    Yes, that was a somewhat common failure back then. It was a problem that arose during the making of the tank. However, all of the ones I've replaced (including my own), it was a simple swap. There's nothing special to your tank - it's the same 28g tank that is used in lot's and lot's of boats. The newer 28g tank from Dometic should plop right in. If you want, upgrade to the tank that has the vac tank built into (onto) the holding tank and regain some real estate in the engine room. Take a look at Dometic's site. I can't comment on the retailer you're talking about, but Northeast Sanitation is good to deal with - they really know their s--- ;)
     
  5. dannymc

    dannymc New Member

    11
    Jul 10, 2016
    Branford, CT
    2004 Sundancer 320
    Twin Mercury MX 6.2 MPI, V-Drives
    Don't know what your engine room looks like but if you could take it out Defender has Dometic tanks for under $400. Have a 29 gallon tank in mine and I could remove it if necessary. I'd even go down to 25 gallon to make a new one fit. Depends on your setup and usage though.
     
  6. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    Just to avoid confusion for anyone reading through this thread... yours is a 28g tank. Probably just hit the wrong key on the keyboard.
     
  7. AJSB

    AJSB Member

    60
    Feb 24, 2014
    Maryland
    2000 290AJ
    2017 6.2L 350 ECT w/Bravo III Drives
  8. BirdieNumNum

    BirdieNumNum Member

    33
    Mar 16, 2019
    310 Sundancer 2000
    Twin 5.7 Mercruisers w/Bravo III Drives
    Thank you all for the responses. I just received a quote from Environmental Marine for just the tank, all of the grommets and drop shipping for a total of $516.32. I'm going to look around for something lesser expensive but I'll probably end up going this route.
     
    Chris-380 likes this.
  9. Stee6043

    Stee6043 Well-Known Member

    Jun 1, 2015
    West Michigan
    1997 Sundancer 400
    7.4L Gassers
    That's not nearly as bad as I expected. If that's a true drop-in you'd potentially be hours of labor ahead by not having to fab/relocate existing plumbing.
     
    Chris-380 likes this.
  10. sfergson727

    sfergson727 Administrator TECHNICAL Contributor PLATINUM Sponsor

    Oct 12, 2007
    Washington Park Marina, Michigan City
    '07 340 DA, E97, A75, VV4, Soft Top
    '18 Boston Whaler 15 Montauk
    8.1 Mercruiser V-Drives, Mercury 60 HP Bigfoot
    What a crappy conundrum.



    (Sorry, couldn’t resist. )
     
  11. BirdieNumNum

    BirdieNumNum Member

    33
    Mar 16, 2019
    310 Sundancer 2000
    Twin 5.7 Mercruisers w/Bravo III Drives
    Holy Bat Crapman!
     
  12. BirdieNumNum

    BirdieNumNum Member

    33
    Mar 16, 2019
    310 Sundancer 2000
    Twin 5.7 Mercruisers w/Bravo III Drives
    So, an update. I ordered the tank and grommets. It will be here early next week. I had a 'waste system engineer' lined up to do the work and I was going to help but he crapped out on me. Looks like I'm doing it myself. I'm not worried though, it looks fairly easy. Since the waste tank will be out, what else do I need to replace while it's out?
     
  13. bobeast

    bobeast Dance the Tide SILVER Sponsor

    Oct 22, 2017
    Isleton, CA
    2002 310DA
    350 MPI w/V-drives
    Your fart-filter (although thats relatively easy to replace with the tank in place)
     

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