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  #1  
Old 05-17-2008
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Question macerator pump test

I rebuilt my macerator pump and it works fine. my question is when I tested the pump by puting water in the waste removal tube when it reached a level in the tank above the tru hull fitting the pump was hooked to, it started dripping water out. There is no valve in the exit line from the pump to the thru hull fitting. My test was done with cap off the waste removal tube. MY thinking is that air is coming from the top wast removal tube and allowing the water to flow out the exit line. This being said, that means the system has to maintain a vacumn of sorts. Is my thinking accurate.
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Old 05-17-2008
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No one answered fast enough so you posted the same question 20 minutes later ? Really bad form there Dave.
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It would really help if you could coherently describe setup and then describe the method you used to test it and then the problem you're seeing.

What you wrote above really doesn't make much sense AFAICT.

The fact that the cap is off of the waste pumpout deck fitting doesn't mean much...since the holding tank is normally vented...

Is there a diverter valve in the deck pumpout fitting line, that selects whether you're emptying the tank using the macerator or the deck fitting? If there isn't, there probably should be.

There should also be a ball valve or seacock between the macerator pump and the through-hull, since, if the hose fails, you won't have any way to quickly stop the water from coming into the boat and then your boat will sink.

Unless your holding tank is below water level and uses a top-mounted pickup tube, the amount of vacuum pressure that the macerator pump needs to generate is minimal, since gravity and air pressure will both be working to force the waste through the macerator pump.

BTW, as Freesail points out, it is rather tacky and rude to post the same question multiple times to try and hasten a response. I'd highly recommend that you read the POST in my signature to get the most out of your time here on sailnet.
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