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06-22-2020, 11:23 AM
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#1
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Junior Member
Join Date: Jun 2020
Location: Sauble Beach
Posts: 1
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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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06-22-2020, 11:27 AM
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#2
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,345
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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.
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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06-23-2020, 03:48 PM
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#3
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Senior Member
Join Date: Jan 2014
Location: Winnipeg, Canada
Posts: 1,196
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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.
__________________
2018 Jayco Eagle HT 265BHS (previous: 2015 23RB Passport Elite, ProPride)
2015 F250 XLT SB Crew, 6.2l gas
PullRite 16K SuperGlide w/SuperRail
Reese 5th Airborne (bagged) Pin Box
RoadMaster Shock Kit
X-Factor Cross Bracing
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06-23-2020, 04:55 PM
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#4
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Senior Member
Join Date: Oct 2018
Location: Southern California
Posts: 1,286
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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-
__________________
Mike
2017 F250 6.7 Powerstroke FX4 crew cab
2016 Hideout 24BHSWE (27 foot TT)
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06-23-2020, 05:06 PM
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#5
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,345
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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
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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06-23-2020, 06:05 PM
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#6
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Senior Member
Join Date: Dec 2019
Location: Oregon High Desert
Posts: 1,553
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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!
__________________
Gary & Deb (44 years)
RV: Keystone 2013 Alpine 3495FL
TV: 2014 RAM 3500HD Laramie Long Box, 6.4 HEMI, 4x4, 4.10's, with Mopar Puck system, and a B&W Companion hitch.
Retired Firefighter/EMT.
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06-28-2020, 01:05 PM
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#7
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Member
Join Date: Nov 2012
Location: Texas Hill country
Posts: 97
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Black tank flush
Quote:
Originally Posted by Logan X
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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Ours was installed backward on our 2014 28RLS. Not sure why they can't get it right?
__________________
2021 Montana High Country 295RL
2015 6.4 Hemi Ram 2500
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07-01-2020, 01:01 PM
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#8
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Senior Member
Join Date: Sep 2019
Location: Florissant
Posts: 702
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Quote:
Originally Posted by chuckster57
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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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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Skids
2019 Bullet 248RKS
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07-01-2020, 02:35 PM
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#9
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,996
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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.
__________________
John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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07-01-2020, 03:14 PM
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#10
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,345
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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.
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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07-01-2020, 05:45 PM
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#11
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Senior Member
Join Date: Jul 2014
Location: Hemlock
Posts: 816
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Quote:
Originally Posted by chuckster57
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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What??!! You make sure it works before the customer gets it? LOL That's what missing in most places now days.
__________________
R.J. and Ginger
2019 Ram 3500 6.7 HO, Aisin Trans 3:73
Reese Goosebox
2019 Sandpiper 379FLOK
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07-01-2020, 05:50 PM
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#12
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,345
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Quote:
Originally Posted by tech740
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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That’s because I was trained by a stickler for details..becomes a habit. Hopefully only about 26 more months to total retirement.
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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07-05-2020, 01:19 PM
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#13
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Senior Member
Join Date: Apr 2018
Location: Parker, Colorado
Posts: 126
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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.
__________________
Phil & Alberta Saran
2019 Keystone Cougar 30 RLS 5er
2012 Dodge Ram 3500 diesel 4x4
Colorado
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