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Old 06-22-2020, 11:23 AM   #1
Molson
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Black Tank Flush Does Not Work

I have a 2020 291rls and used it for the first time this past weekend.
I went to use the black tank flush and it did not work. There was pressure at the connection, however it did not flow.
Is there a shut off valve somewhere or is it something else?
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Old 06-22-2020, 11:27 AM   #2
chuckster57
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Welcome to the forum

I’m willing to bet the anti siphon valve is installed backwards. It’s probably under the bathroom sink and would require changing fittings. Since your under warranty I would let the dealer do it. Should have been addressed at the PDI by the tech that got your unit ready.
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Old 06-23-2020, 03:48 PM   #3
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The pex on our passport had a kink in it that prevented water flow. An elbow took care of the issue.
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Old 06-23-2020, 04:55 PM   #4
Logan X
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Like Chuckster said, check the anti siphon valve. It’s probably under the sink in the bathroom. There is a arrow on it that shows the direction water flows. It might be installed backwards. It looks like this-
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Old 06-23-2020, 05:06 PM   #5
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Model year 2020 is the first year “Aspen Trail” trailers have come from the factory with a black tank rinser. So far EVERY unit we have touched has had it plumbed backwards
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Old 06-23-2020, 06:05 PM   #6
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The black tank flush feature has never worked on our Alpine either.

I agree with the thought that the anti siphon valve was installed wrong.

However the valve is not under the bathroom sink. So the next logical (?) spot suggested was behind the shower. There is no panel to access the shower plumbing, so I removed the control valve assembly and looked for the anti siphon, but no luck there. Even if it was, there would be no way to grab it and make any changes.

So, I just gave up my search and use the clear twist on adapter, and connect it to the drain fitting. This also has a hose connection on it to allow a garden hose to be hooked up to back flush the tanks.

Works for me!
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Old 06-28-2020, 01:05 PM   #7
81SHOVELHEAD
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Black tank flush

Quote:
Originally Posted by Logan X View Post
Like Chuckster said, check the anti siphon valve. It’s probably under the sink in the bathroom. There is a arrow on it that shows the direction water flows. It might be installed backwards. It looks like this-
Ours was installed backward on our 2014 28RLS. Not sure why they can't get it right?
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Old 07-01-2020, 01:01 PM   #8
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Quote:
Originally Posted by chuckster57 View Post
Model year 2020 is the first year “Aspen Trail” trailers have come from the factory with a black tank rinser. So far EVERY unit we have touched has had it plumbed backwards
Hey Chuckster, I have used ours only once and it made kind of a loud vibrating/humming sound. Is that normal?
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Old 07-01-2020, 02:35 PM   #9
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Yes, the rush of water through the valve causes a vibration/hum that can sound like it's about to self destruct.

One caution, don't use a 1/4 turn twist valve on the end of your hose or don't turn the water faucet on too fast. Doing that will put a "slamming water pressure" on the fragile valve and can break the interior, causing it to leak into the vanity. Slowly turn on the water to the flush system, so the valve feels a "gradually increasing water pressure". I use a regulator set at 40 PSI and haven't "lost a valve" since I started slowly turning on the water.
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Old 07-01-2020, 03:14 PM   #10
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Like John said it’s normal. During PDI, I listen first for that familiar “hum” that lets me know water is flowing.
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Old 07-01-2020, 05:45 PM   #11
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Quote:
Originally Posted by chuckster57 View Post
Like John said it’s normal. During PDI, I listen first for that familiar “hum” that lets me know water is flowing.
What??!! You make sure it works before the customer gets it? LOL That's what missing in most places now days.
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Old 07-01-2020, 05:50 PM   #12
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Quote:
Originally Posted by tech740 View Post
What??!! You make sure it works before the customer gets it? LOL That's what missing in most places now days.
That’s because I was trained by a stickler for details..becomes a habit. Hopefully only about 26 more months to total retirement.
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Old 07-05-2020, 01:19 PM   #13
Phil Saran
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I have a 2019 Keystone Cougar 30RLS 34 foot 5th wheel and the flush
feature did not work either.

When I took it in for the end of the year check up and final warranty
list that item was on my list. They fixed most of the stuff not that.

I took the door off the cabinet and while laying on my back was able
to swap the two fittings so the black tank flush worked as it should.

Also had the wheel bearings repacked at that time and while putting
them back together the tech found that both axles were bent.

Luck for me that the Dexter Axles have a longer warranty than the
trailer does. So new axles were ordered and installed.
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