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Old 02-06-2015, 15:47   #1
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Holding tank Pump

Hi
Can anyone help me with a really annoying problem I have with my holding tank. It just will not pump out. Have bought 2 new kits, so I know there is no electrical fault. New pump is sound. When I get tank out fill it with water it pumps out perfectly. The minute it goes back inside it won't pump out. What am I doing wrong ? Desperate
Chrissy
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Old 02-06-2015, 15:49   #2
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Re: Holding tank Pump

Now the impeller has just snapped on new pump ...getting really angry now !!!!!
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Old 02-06-2015, 17:44   #3
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Re: Holding tank Pump

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Originally Posted by Chrissyking View Post
Now the impeller has just snapped on new pump ...getting really angry now !!!!!
I'm guessing a blocked tank vent is the source of your woes, most likely the vent thru-hull. When the tank is out, the vent fitting on the tank is open, providing the necessary source of air to prevent your macerator pump from pulling a vacuum that won't allow anything to be pumped out. When you put it back, the pump pulls a vaccuum. The impeller snapped because running dry "fried' it.

Spring is when the mud daubers love to build their mud nests in any opening they can find...or, the vent thru-hull--and maybe the vent LINE too--may just be clogged with waste that's spilled into it when the boat heels. Cleaning out the thruu-hull--and maybe the vent line too--should solve your problem.

The good news: at least you're only dealing with water till you've solved the problem...not a tankful of waste!
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Old 02-06-2015, 17:53   #4
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Re: Holding tank Pump

Maybe a bad check valve? Sometimes they are called duckbill valves. Your pump would be just spinning the stuff around without a sense of direction. On mine, there are 2, in the same direction, before and after pump - so the action is 2 stage: suck it in - push it out.


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Old 02-06-2015, 17:55   #5
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Re: Holding tank Pump

What kind of pump are you using. I don't think you want a pump with an impeller on the output of a black water tank.

Something like this may be better but others with more experience might have a better suggestion.
Whale Marine - Products
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Old 02-06-2015, 18:04   #6
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Re: Holding tank Pump

All the macerator pumps I have used are impellor driven but have a metal macerator before they pump ! They claim to lift 5 feet but I have always had to drop them below the tank level to get good output
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Old 02-06-2015, 18:16   #7
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Re: Holding tank Pump

Yes, metal that wont break when you are pumping water. Some home waste water pumps are cast iron impellers.
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Old 03-06-2015, 06:36   #8
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Re: Holding tank Pump

Greetings and welcome aboard the CF, Chrissy.
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Old 03-06-2015, 06:56   #9
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Re: Holding tank Pump

Do you have photos of your pump, or brand name? Mine is by SeaLand, and I don't believe it has an impeller - bellows action is used instead. $275 or so at defender.


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Old 05-06-2015, 05:05   #10
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Re: Holding tank Pump

Hi guys. All fixed. Replaced all pick up pipes, including inside solid. Somebody had previously botched some home domestic plumbing pipes :/. Plus new service kit for pump. Many thanks to all of you for your help and suggestions and yes thank god it was only water in there
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Chrissy x
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Old 05-06-2015, 05:06   #11
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Re: Holding tank Pump

Thanks Gord may for welcome. Have a good weekend. 👍
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