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Proper procedure for black water pump out

Discussion in 'Carver Yacht' started by Jnicholas, Aug 9, 2022.

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  1. Jnicholas, Aug 9, 2022
    #1
    Jnicholas

    Jnicholas Member

    Joined:
    Dec 7, 2013
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    Location:
    Long beach ca
    Recently moved to a new dock that provides fitting for pump out in our slip.

    in past years I paid for the service as I did not want to pump overboard in the ocean, and pumping out at public dock was just never very convenient.

    I have two tanks, port and starboard. In the engine room there is a valve to choose between these two tanks when pumping overboard. I exercise the valve with all others. When pumping out from deck fitting it appears the position of the valve is irrelevant. Is that a correct assumption?

    which leads to the question that as it gets near the end of pumping out, it will hesitate and then have a small burst of waste. Tank does not seem to empty completely. So is the valve effecting this or is it more likely that a vent is slightly clogged?

    if the vent involved, what is best way to clear it?

    thanks as always, Jerry
  2. Pascal, Aug 9, 2022
    #2
    Pascal

    Pascal Senior Member

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    How many deck fittings do you have, one or two?

    Only one pump for two tanks? Odd… sounds like builder tried to save a buck. Normally you want a pump for each tank at least for redundancy.

    when pumping out the pump / tank selector valve should be irrelevant.

    if both tanks are on the same fitting, again a penny pinching decision, then when one is empty before the other the hose will suck air.

    as to the vent, check if you have vent charcoal filter. They cut down on smells outside the boat when flushing but will clog if the tank gets full. Follow the vents and see if you have them
  3. Jnicholas, Aug 9, 2022
    #3
    Jnicholas

    Jnicholas Member

    Joined:
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    Location:
    Long beach ca
    Two deck fittings.

    yes one pump for both tanks. You select by moving the diverter valve to either port or starboard. Located on the forward bulkhead in the engine room. Power switch on the breaker panel in the salon. Very inconvenient, but it does prevent accidental discharge.

    definitely only one macerator pump. It was frozen on purchase of boat. Replaced and used a couple of times but with short handed crew I don’t use it much.

    the vents are another story. I see the line but no filter. Part of the line goes behind the fuel tanks but I can’t believe they would put the filter where it is unreachable.
  4. Pascal, Aug 9, 2022
    #4
    Pascal

    Pascal Senior Member

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    8,149
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    Ok so at the end when you see air being sucked in and then a bit of black water coming out it s pretty normal

    let me guess… the macerator is one of the pos impeller style jabsco? Worthless. Next time it fails put in a sealand bellow pump. They last forever
  5. Poppa John, Aug 10, 2022
    #5
    Poppa John

    Poppa John New Member

    Joined:
    Sep 4, 2012
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    Location:
    Naples Florida
    Some boats with two heads and two tanks and have a transfer pump from one tank to the main holding tank .
  6. Capt Ralph, Aug 10, 2022
    #6
    Capt Ralph

    Capt Ralph Senior Member

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    Please tell me you just made that up.
    Who in their rite mind would deliver a boat with that set up?
    Carver would not step that low.

    I used to managed a few carvers. Dual black tanks, dual plumbing for each. Never connected.
    Not with out factory headaches but never connected......
  7. Capt Ralph, Aug 10, 2022
    #7
    Capt Ralph

    Capt Ralph Senior Member

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    For the OP, time to get in sync with your boat. Start following hoses and figure it out.
  8. Poppa John, Aug 11, 2022
    #8
    Poppa John

    Poppa John New Member

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    Location:
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    First off, I never said it was a Carver and secondly there is a JOHNSON M/Y , I believe a 48 or 49 ft. in our marina that has that set up. Now I don't know if the present or a previous owner installed it but this one has it.