Vacuflush pump cycling

Discussion in 'General Maintenance/Repair Questions' started by spirt320, Dec 8, 2015.

  1. spirt320

    spirt320 Member

    122
    Aug 4, 2014
    Lake Travis, TX
    2013 Meridian 341 NSB,Two Merc 8.2 HO MPI, 425 HP each, Kohler 7.5 kW genset, Dock On Command
    8.2 Mercruiser HO MPI inboards
    Unit is three years old. Within the last couple weeks I replaced all four duck bill valves, the vacuum pressure switch and the heads seals etc... But as it did before I did all of that, it still pumps/cycles about every 20-30 minutes for about 20 seconds at a time. I cannot locate any leaks and am at a loss for what to do next. Thought about maybe adjusting the pressure switch, but have heard some people advise against changing it from the factory setting. Any thought?
     
  2. FootballFan

    FootballFan Well-Known Member PLATINUM Sponsor

    Jun 20, 2012
    Florida
    Marquis 59
    MTU Series 60
    Have you cleaned the ball? Quick fix, take a brush - or even paper towels go around the ball while holding your foot down.

    Next may be the seals in the unit itself. I had one that was running too much - put in a seal kit that is available (in the head itself) - took care of the problem.

    Just a couple of ideas...

    Mark
     
  3. spirt320

    spirt320 Member

    122
    Aug 4, 2014
    Lake Travis, TX
    2013 Meridian 341 NSB,Two Merc 8.2 HO MPI, 425 HP each, Kohler 7.5 kW genset, Dock On Command
    8.2 Mercruiser HO MPI inboards
    Yes sir, cleaned it all. Completely removed the commode from the boat, cleaned from top to bottom and put new seals in etc...
     
  4. bbwhitejr

    bbwhitejr Well-Known Member SILVER Sponsor

    Apr 14, 2013
    Lake Lanier GA
    2007 44DB
    Cummins QSC 8.3s
    Very likely a leak at a hose or fitting...I have heard you can take shaving cream and coat the joints like you would use soapy water to find an air leak. If a vacuum leak, the shaving cream will "suck" into the leak.

    Bennett
     
  5. spirt320

    spirt320 Member

    122
    Aug 4, 2014
    Lake Travis, TX
    2013 Meridian 341 NSB,Two Merc 8.2 HO MPI, 425 HP each, Kohler 7.5 kW genset, Dock On Command
    8.2 Mercruiser HO MPI inboards
    Thanks, I will try and give that a shot this weekend.
     

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