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Old 07-01-2017, 06:54 PM   #1
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Brand: Thor Motor Coach
Model: ACE 27.1
State: Virginia
Posts: 315
THOR #7607
Greywater dump pauseing

I have a '16 Ace. When I dump I usually let the backwater go first. That seems to go in one continuous flow until empty. Then I close that valve and let the Greywater go 2nd to help rinse the hose out, but the Greywater seems to flow for a while and the gurgle like it's in a airlock situation and will then drain some more before finishing. Shouldn't the Greywater tank be vented so that there would be no hesitation when draining it?
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Old 07-01-2017, 08:15 PM   #2
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Brand: Thor Motor Coach
Model: Tuscany 40KQ
State: Arizona
Posts: 2
THOR #8112
Sounds like you may have a blockage in the vent to atmosphere (if your coach has such a vet pipe through the roof) or if not then a malfunctioning "Air Admittance Valve" which may be located (if more than one) under the sinks, or behind the washer dryer.
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Old 07-02-2017, 01:48 AM   #3
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Brand: Redwood
State: Texas
Posts: 1,319
THOR #3610
Mine does the same & I suspect they got the vent that goes through the roof shoved too far into the grey tank so it drains slowly til it gets below the vent pipe.
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