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  1. #1
    Join Date
    Feb 2009
    Location
    Northwest Arkansas
    Boat
    Sea Ray
    Details
    1988 3oo Weekender 1988 300 Sundancer 1993 Maxum 2300 SCR 1994 Ranger 354XT
    Engine(s)
    too numerous to mention
    Posts
    750

    Vacuflush run on question

    Since I have both engines out right now, I figured I should go ahead and attack the VAcuflush "run on" problem .

    The toilet flushes fine but the vaccuum pump will not shut off. I've read several articles from you folks that have mastered this (stinky) technique!

    Can someone give me some instructions? It is an 88 300 Sundancer.
    Thanks!
    Jim Crews, NW Arkansas
    (Current stock, yeah, I know)
    88 Sea Ray 300 Weekender, 88 Sea Ray 300 Sundancer
    91 Glastron 190, 90 Arriva 19 (something)
    92 Maxum 2300SR (7.4/Bravo)
    94 Ranger 354XT Bass Boat, 94 Bayliner 2050LS

  2. #2
    Join Date
    Nov 2009
    Location
    SF BAY AREA
    Boat
    Sea Ray
    Details
    2003 410DA, 2004 C14 Caribe
    Engine(s)
    CAT 3126TA's 350HP/ 50HP Honda
    Posts
    6,588

    Re: Vacuflush run on question

    Quote Originally Posted by speakrdude View Post
    Since I have both engines out right now, I figured I should go ahead and attack the VAcuflush "run on" problem .

    The toilet flushes fine but the vaccuum pump will not shut off. I've read several articles from you folks that have mastered this (stinky) technique!

    Can someone give me some instructions? It is an 88 300 Sundancer.
    Thanks!
    Buy some new duckbills and they will have instructions and diagrams for the install. Check your hoses to see if they are good and replace if needed. Make sure all clamps are doubled and tight.

  3. #3
    Join Date
    Feb 2009
    Location
    Northwest Arkansas
    Boat
    Sea Ray
    Details
    1988 3oo Weekender 1988 300 Sundancer 1993 Maxum 2300 SCR 1994 Ranger 354XT
    Engine(s)
    too numerous to mention
    Posts
    750

    Re: Vacuflush run on question

    I just came across this article.

    The Duck Bill Valves are the parts that allow the vacuflush system to create
    and hold vacuum. There are 4 duck bill valves in each suction pump and two in
    each transfer pump. They are located in the nipples where the hoses attach.
    Standard maintenance on your vacuflush system is to replace every 5 years. Keep
    a spare set on the boat for emergencies. These duck bill valves fit ALL pre-2006
    Vacuflush pumps and are sold separately. You should order 4 for a suction pump
    or 2 for a transfere pump. The symptom will be that the suction pumps turns on
    and off frequently for no apparent reason. When troubleshooting this is the
    first part to replace. Each sold separately.

    I removed the pump out, pump a while back to replace it with a holding tank. I have 1 pump looking thing and the big white vaccuum cleaner looking torpedo. How many duckbills do I need to replace?
    Jim Crews, NW Arkansas
    (Current stock, yeah, I know)
    88 Sea Ray 300 Weekender, 88 Sea Ray 300 Sundancer
    91 Glastron 190, 90 Arriva 19 (something)
    92 Maxum 2300SR (7.4/Bravo)
    94 Ranger 354XT Bass Boat, 94 Bayliner 2050LS

  4. #4
    Join Date
    Nov 2009
    Location
    SF BAY AREA
    Boat
    Sea Ray
    Details
    2003 410DA, 2004 C14 Caribe
    Engine(s)
    CAT 3126TA's 350HP/ 50HP Honda
    Posts
    6,588

    Re: Vacuflush run on question

    Pictus would be great but I would guess 4. You buy them in sets of 2 usually.

  5. #5
    Join Date
    Feb 2009
    Location
    Northwest Arkansas
    Boat
    Sea Ray
    Details
    1988 3oo Weekender 1988 300 Sundancer 1993 Maxum 2300 SCR 1994 Ranger 354XT
    Engine(s)
    too numerous to mention
    Posts
    750

    Re: Vacuflush run on question

    Picture of the (Dusty from new transom install) Toredo Vacuflush thingamajigger.



    Picture of transfer pump maybe?

    Jim Crews, NW Arkansas
    (Current stock, yeah, I know)
    88 Sea Ray 300 Weekender, 88 Sea Ray 300 Sundancer
    91 Glastron 190, 90 Arriva 19 (something)
    92 Maxum 2300SR (7.4/Bravo)
    94 Ranger 354XT Bass Boat, 94 Bayliner 2050LS

  6. #6
    Join Date
    Jan 2008
    Location
    Virginia Beach, VA
    Boat
    Sea Ray
    Details
    410 Sundancer - 2001
    Engine(s)
    Twin 8.1L Mercruisers - 2009
    Posts
    4,029

    Re: Vacuflush run on question

    410 Sundancer

  7. #7
    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
    1,572

    Re: Vacuflush run on question

    Quote Originally Posted by speakrdude View Post
    Picture of the (Dusty from new transom install) Toredo Vacuflush thingamajigger.



    Picture of transfer pump maybe?

    Top pic is the vacuum canister on the right side of the pic under the white cap on the end is a pressure switch, replace it.
    Its not cheap...but IS a wear item and will fail.

    Bottom pic is a vacuum pump replace all 4 duck bills.
    They are in the lines on the outside of the pump.

    Now start looking for a hose leak if you still have a problem or might need a new bellows.

    Its all easy but, a dirty job a best.
    Mark.

  8. #8
    Join Date
    Feb 2010
    Location
    Connecticut
    Boat
    Sea Ray
    Details
    1989 30' Sundancer
    Engine(s)
    5.7 with alpha 1 drives
    Posts
    170

    Re: Vacuflush run on question

    There is a vacuum switch mounted into the right side of the tank. They have like a diaphragm which goes over time. Then the switch never senses that pressure is up and doesn't shut off. Have to replace switch. Check duck bills, hose clamps, and seal in toilet. If water stays in bowl, it is not the toilet seal.

  9. #9
    Join Date
    Feb 2009
    Location
    Northwest Arkansas
    Boat
    Sea Ray
    Details
    1988 3oo Weekender 1988 300 Sundancer 1993 Maxum 2300 SCR 1994 Ranger 354XT
    Engine(s)
    too numerous to mention
    Posts
    750

    Re: Vacuflush run on question

    Replaced the 4 duck bill valves, and found 35 CENTS!! See, it's not all bad. (however, I did throw the quarter and dime away)
    Jim Crews, NW Arkansas
    (Current stock, yeah, I know)
    88 Sea Ray 300 Weekender, 88 Sea Ray 300 Sundancer
    91 Glastron 190, 90 Arriva 19 (something)
    92 Maxum 2300SR (7.4/Bravo)
    94 Ranger 354XT Bass Boat, 94 Bayliner 2050LS

  10. #10
    Join Date
    Jan 2012
    Location
    Withlacoochee river Yankeetown,FL
    Boat
    searay
    Details
    1989 340 Sundancer Raymarine E120
    Engine(s)
    454's
    Posts
    1,316

    Re: Vacuflush run on question

    Quote Originally Posted by Air O'Nautical View Post
    Top pic is the vacuum canister on the right side of the pic under the white cap on the end is a pressure switch, replace it.



    Its not cheap...but IS a wear item and will fail.

    Bottom pic is a vacuum pump replace all 4 duck bills.
    They are in the lines on the outside of the pump.

    Now start looking for a hose leak if you still have a problem or might need a new bellows.

    Its all easy but, a dirty job a best.
    I have been through all of this. The vacum switch is a lot of $$$. Most likely it is just the duckbill valves. Change those and make sure your seal in the head is holding water.

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