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Old 05-01-2014, 11:02 AM   #1
Join Date: Jan 2014
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Black tank flush

I just tried to use the black tank flush for the first time. Is there some sort of trick? The water will not flow into the tank.

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Old 05-01-2014, 11:26 AM   #2
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There should be a check valve somewhere along that water line. Yours might be installed backwards. I'm not familiar with the wetbay on that model, on my Berkshire the access is on the PS and I can see the black tank there. The washer is held on by three screws, if yours is the same take the screws out, pull the washer out and see if you are getting water to it.

2013 Berkshire 390BH
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Old 05-01-2014, 12:01 PM   #3
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I have a GT378 and the backflow valve is in the washing machine provisional area and zip tied to the plumbing for that washer. If you have emptied your black tank before and not ran water thru the cleanout the nozzle for that cleanout may be cloged with tank residue. If you locate the backflow valve and it's a clear one as is mine you will see how it is supposed to operate. It's just a simple water pressure switch.
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Old 05-01-2014, 03:46 PM   #4
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Looks like this inside one of the bedroom closets and may be behind a piece of wood panel. Usually close to where the washer dryer is hooked up at.
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Old 05-06-2014, 10:21 AM   #5
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I have the same issue. Did you ever correct yours?
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Old 05-06-2014, 10:46 AM   #6
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This is a Vacuum Breaker required by Code to prevent the possible siphoning of contaminated liquids back into the water supply. If the Breaker is installed with the bonnet in the up position, it should work as designed and allow water to flow into the dark water tank.
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Old 05-06-2014, 06:22 PM   #7
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I have a scheduled repair. I'll let you know what they say.
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Old 05-06-2014, 06:39 PM   #8
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How fast should water flow into tank? Mine goes in but seems like a seems slow, not like when I use the discharge valve flush. Should water trickle out of the tank when flushing or a fast flow?
Mark and Joanne
2014 Fun Finder XT 276
2015 Ford F150 Lariat 3.5 Ecoboost 4X4 SCrew Max Tow
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Old 05-06-2014, 08:29 PM   #9
Join Date: Mar 2014
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I tried the black tank flush on my last trip....I have a new GT 328. If you just plug the hose in, have the black tank valve open, and turn on the hose, the water comes out in a steady stream, but without the large "swoosh" that you get when you open that big valve with a full tank. I closed the valve, let the tank level build up, and then opened the valve. I did that a few times, then I turned off the flush hose, closed the black valve, and opened the grey valve. I don't know if I did it exactly correctly, but it seemed to work.
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Old 05-07-2014, 07:14 PM   #10
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that's the way I flush mine. I do this until clear water only comes out.

Andrew & Donna Reyes
2012 Georgetown 378XL
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