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  1. #1
    Join Date
    Jul 2016
    Location
    naples
    Boat
    sea ray
    Details
    370 dancer
    Engine(s)
    8.1 horizons
    Posts
    8

    93 dancer vacum loss in the head

    Good morning,


    I am new to the club so please be gentle. I have a 93 370 dancer which lost vacuum pressure over the weekend, the water system still works, I was able to run a snake all the way to the holding tank, and when I remove the line to the holding tank water drains by gravity


    I am assuming it is a valve or a pump motor that creates the vacuum as there is nine when the foot pedal is depressed


    Help!!!!

  2. #2
    Join Date
    Feb 2008
    Location
    Stamford CT "Ponus Yacht Club"
    Boat
    Searay
    Details
    1995 400EC. Raymarine E80,4kw dome, Garmin 235 gps, 11ft Baltik / 15hp on St croix davits.
    Engine(s)
    2013 7.4L Mercruiser Blue water. Hurth straight shaft 630's, Westerbeke 7.0 BCG
    Posts
    2,020

    Re: 93 dancer vacum loss in the head

    Welcome to CSR :)

    Assuming you have a Vacuflush system..you can get parts from several places.
    https://www.northeastsanitation.com is one..

    I'm going to recommend start by replacing the 4 duck bill valves that are located 2 in the inlet and 2 outlet of your Vacu pump.
    These are often sold in a 2 pack so, you'll need to buy 2 to get all 4.
    1 1/2 inch should be the size.

    I'd recommend to pump-out, add water, pump-out again several times because, your needing to remove the black water lines on either side of the pump to access the duck bill valves.
    Its not all that bad, if your holding tank is as empty as possible..wear gloves ;)

    Might be best to remove the pump and inspect/clean it on the bench.


    Good luck,
    Last edited by Air O'Nautical; 01-02-2017 at 11:53 AM.
    Mark.

  3. #3
    Join Date
    Jul 2016
    Location
    naples
    Boat
    sea ray
    Details
    370 dancer
    Engine(s)
    8.1 horizons
    Posts
    8

    Re: 93 dancer vacum loss in the head

    thanks!!!!

  4. #4
    Join Date
    Oct 2007
    Location
    Hampstead NC
    Boat
    searay
    Details
    500 dancer, previous 420,390,300 dancers
    Engine(s)
    detriot 8v92
    Posts
    1,338

    Re: 93 dancer vacum loss in the head

    Can you hear the pump running, if not make sure head breaker is on. Also make sure power is actually getting to the pump. You will most likely have to replace duck bills since you ran a snake thru them, they are one way and probably damaged them when running snake.

  5. #5
    Join Date
    Jan 2012
    Location
    Yankeetown FL West coast
    Boat
    Searay
    Details
    89 340 Sundance all Raymarine.
    Engine(s)
    Gas hogs 454X2.
    Posts
    2,399

    Re: 93 dancer vacum loss in the head

    Try turning on the 12V switch at the dash............spend no money

  6. #6
    Join Date
    Feb 2010
    Location
    Connecticut
    Boat
    Sea Ray
    Details
    1989 30' Sundancer
    Engine(s)
    5.7 with alpha 1 drives
    Posts
    182

    Re: 93 dancer vacum loss in the head

    If the motor doesn't work, there is a fuse for the motor. The fuse may be under the dash, possibly another by the motor. Good to check. Sometimes the pump motor stops on a dead spot. A sharp wack gets it going. Use the wrong kind of toilet paper and fibers can build up and jam the bellows pump. Ask how I know these things.
    There is a difference between won't make vacuum and won't hold vacuum.

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