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Old 02-05-2018, 05:28 PM   #1
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Sewer Flusher

I have a 2014 FR Forester 2701DS. The sewer flusher will run for about 1 or 2 seconds, then quits. Then back pressure begins building up in the water hose. Any ideas as to what is causing this? Any ideas on a fix?

Thanks.
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Old 02-05-2018, 05:46 PM   #2
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likely clogged. There is a small fitting that enters the black tank and spins. Here is a pic of the hardware that is used. https://www.amazon.com/Camco-40126-T.../dp/B000BUU5TU

I have read others posts that if you use toilet treatment it will likely unclog on its own.
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Old 02-05-2018, 06:08 PM   #3
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BTW: It's called a black tank flusher, not a sewer flusher. FYI
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Old 02-05-2018, 07:34 PM   #4
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Quote:
Originally Posted by bjlakatos View Post
likely clogged. There is a small fitting that enters the black tank and spins. Here is a pic of the hardware that is used. https://www.amazon.com/Camco-40126-T.../dp/B000BUU5TU

I have read others posts that if you use toilet treatment it will likely unclog on its own.
No, that is a DIY aftermarket kit. The factory does not install one of those. The factory install has no resemblance.
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Old 02-05-2018, 10:04 PM   #5
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Quote:
Originally Posted by bjlakatos View Post
likely clogged. There is a small fitting that enters the black tank and spins. Here is a pic of the hardware that is used. https://www.amazon.com/Camco-40126-T.../dp/B000BUU5TU

I have read others posts that if you use toilet treatment it will likely unclog on its own.
We have always used a toilet treatment after every flush. And even used a garden hose flush with high pressure/volume water down the toilet after dumping.
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Old 02-05-2018, 10:06 PM   #6
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Originally Posted by rockfordroo View Post
BTW: It's called a black tank flusher, not a sewer flusher. FYI
Thanks. I was just using the terminology on the label above the flusher.
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Old 02-06-2018, 12:01 AM   #7
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Thanks. I was just using the terminology on the label above the flusher.
Interesting.

I've never seen it referred to that way. It doesn't flush the sewer; it flushes the black tank.

My Mini Lite 2503S says "Black Tank Flush."
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Old 02-06-2018, 11:56 AM   #8
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Doing more digging, Bubbles noted above the oem system is a bit different.

The backflow preventer on the oem version is more sophisticated. A pic below shows a vacuum breaker device (vs aftermarket inline valve). Click image for larger version

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The breaker valve is shown here https://www.etrailer.com/Accessories...xoCJpYQAvD_BwE

Mine is located under the bathroom sink.

This also explains why I had unexpected water leaking under the sink when using too high water pressure for flushing (will use a pressure regulator going forward)

I suspect the spinner inside the tank is similar to the aftermarket version.

Also read where the failure of this breaker stopped flow to the tank flusher.

Also a reminder to blow air through the black flush port to clear any water.
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Old 02-06-2018, 01:32 PM   #9
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The factory install has to be in IAW plumbing code IAPMO TSC 27 which requires a vacuum breaker-check valve installed a minimum of 6" above the highest flood level rim of any fixture (typically the toilet in an RV) connected to the holding tank. The cleanout can be of several designs, mine is not a sprayer. The DIY does have a check valve but it is in the spray head. The DIY works perfectly. I've installed and used one for a number of years with no issues. This is not a big deal, just thought I would point out the differences.
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Old 06-04-2018, 06:24 PM   #10
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Tagging on to this thread, here. We have the OEM flusher system on our 2017 Sunseeker 2430S coach, and it works great! That is it worked great until this weekend, when we hooked it up, and couldn't hear the water spraying in the tank. We stopped the water after just a few seconds, then found that water had sprayed all over inside the bathroom cabinet, then run under all the kitchen cabinets, then out the main door. Could it be that the vacuum break has plugged or otherwise failed?
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