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Old 05-03-2014, 05:27 PM   #1
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Black tank flush

Does anyone know where the check valve/vacuum breaker, (not sure what it's called), for the black tank flush is located on a 3120 Sunseeker? It quit working and I really don't think it's clogged in the tank, it tries to work when I turn on the water but the more pressure I put on it just stops. Any help will be appreciated. Thanks.
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Old 05-08-2014, 02:37 PM   #2
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Black tank flush

Someone must know where this thing is located, Brian? Big John?
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Old 05-08-2014, 09:46 PM   #3
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It's under the bathroom sink. Look up high.
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Old 05-12-2014, 09:51 AM   #4
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So what is the fix for this.. I use to be able to hear the flush water spraying in the tank but the last time I tried it it seams like the same thing as Six Pack.. turn the water on and nothing.. is it something that needs to be cleaned or replaced?
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Old 05-12-2014, 09:59 AM   #5
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System is not that complicated. Except for a plugged screen at the hose connection it can only be the vacuum breaker under the sink or the flush nozzle in the tank. I'd start by removing and disassembling the vacuum breaker. If that's okay then pull the flush nozzle from the tank.
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Old 05-12-2014, 10:00 AM   #6
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Mine quit in our 3121. Checked the vaccum break under the sink and all ok. Pulled the nozzle out of the tank, and broke down toilet paper had managed to get all the way through the holes and dry into a plug. First time that had ever happened to any black flush nozzle. After that, I never let the tank get as full as I did that time.

On the vacuum break, I usually ditch those and put one at the inlet, provided it's in a wet bay or outside. Also use a designated hose. Code requires them to be mounted above the toilet which is why you find them under the sink a lot of times. Almost every one I've had has leaked, which is not cool if you don't catch it. Our mobile scout was in the wall and leaked, our Tiffin was under the bathroom sink, and leaked, the one in our Silverback was under the sink, and leaked. So, usually that's the first item to be cut out of the system for us.
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Old 05-12-2014, 10:07 AM   #7
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You may have seen this before, but when I had to pull the flush nozzle, I went ahead and rerouted the whole outfit to the wet bay. I didn't like the inlet being on the door / passenger side. Here's a link to the whole mod in my photo album.

New Black Flush Inlet - My Photo Gallery
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2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.
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Old 05-12-2014, 10:22 AM   #8
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I did the same thing on my 3120 but added selector valves and a gray water tank flusher along with a coiled up dedicated supply hose. All this was mounted on the divider panel.
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