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Old 04-11-2014, 06:16 PM   #1
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Vacuflush Mystery

The pump out boat arrived and I began to pump the tank as always. We are live aboard and are pumped out once a week. Mysteriously, despite huge suction, the tank would not release its contents. We tried the overboard discharge and despite the discharge pump coming on, nothing was discharged.

The tank is 3/4 full, the vent line appears to be clear. If I run the discharge pump and then open the deck pump out air rushes in leading me to believe the pump is generating suction. My only guess is a clog somewhere in the system.

Any advice will be appreciated. Howard
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Old 04-11-2014, 06:34 PM   #2
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My guess is your vent is plugged, otherwise you wouldn't hear the pressure relief when you opened the deck fitting

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Old 04-11-2014, 06:37 PM   #3
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Therein lies the mystery. I disconnected the vent line completely at the top of the tank. It still won't pump out.
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Old 04-11-2014, 06:39 PM   #4
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Did you push a wire into it to confirm it isn't plugged at the actual fitting?

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Old 04-11-2014, 07:55 PM   #5
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Quote:
Originally Posted by mbevins View Post
Did you push a wire into it to confirm it isn't plugged at the actual fitting?

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I had this very thing happen to me once due to a combination of factors. Is the OP's holding tank part of one of those totally integrated Vacuflush systems? Otherwise I don't understand the reference to "Vacuflush Mystery".
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Old 04-11-2014, 08:11 PM   #6
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Good point, just assumed a standard holding tank

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