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07-09-2017, 08:25 PM
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#1
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Junior Member
Join Date: Feb 2017
Location: Albuquerque
Posts: 23
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Black tank flush
We replaced our Rockwood TT this past March and took our new 5th wheel cougar lite out for the second time. Brought it back today and went to dump the tanks. As I was dumping the black tank I started using the black tank flush, which is where the issued occurred. The flush on this cougar isn't very strong it seems compared to my last camper. I would shut the valve on my old camper to let the flush build up some water in the tank and release it. I would do this a few times to make sure I got everything I could flushed out. So of course I performed the same method on our new cougar. I started the black tank flush, which was getting into the tank and slowly coming out into the dump hose. Then I shut the black tank valve closed to let some water build up in the tank with the flush; one minute later I see water leaking just off to the right of my entrance stairs under the camper. I shut off the water and went into the camper and saw water going across the hall from the bathroom leaking below the floor when going against the wall. The water was coming from under the bathroom sink. I'm assuming the design on the keystones cougar is different than our prior Rockwood and have to have the tank valve open while using the flush at all times. My question is if there is something I need to repair under the sink in the bathroom where the water leaking out? It doesn't seem like I need to and appears to be a relief valve of some sort under the sink?
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07-09-2017, 09:25 PM
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#2
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Senior Member
Join Date: Jul 2013
Location: Box Elder
Posts: 2,907
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It sounds like the air gap/back flow preventor for the flush system is located under the sink. It must be broken, which is where the water is coming from or possibly a hose connection was not properly made.
__________________
Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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07-09-2017, 10:10 PM
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#3
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Senior Member
Join Date: Jul 2014
Location: Nevada
Posts: 2,695
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And its probably a good idea to use a water pressure regulator. The plastic BT flush system can be fragile. I have two. One for the potable supply, white hose and one for the green BT flush hose.
https://www.amazon.com/dp/B003BZD08U...a-274070646123
__________________
Desert185 🇺🇸 (Retired Chemtrail vendor)
-Ram 2500 QC, LB, 4x4, Cummins HO/exhaust brake, 6-speed stick.
-Andersen Ultimate 24K 5er Hitch.
-2014 Cougar 326SRX, Maxxis tires w/TPMS, wet bolts, two 6v batts.
-Four Wheel 8' Popup Camper.
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07-10-2017, 05:54 AM
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#4
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Senior Member
Join Date: Jan 2014
Location: Tidewater Area Virginia
Posts: 1,271
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x2 on both the above ^^^ . Sounds like it's the vacuum breaker or whatever you want to call it. They are very well known for leaking. It's probably either shot or maybe just a loose connection. The usual culprit is forgetting to winterize the BT flush port. A lot of users replace them with an elbow and add their own backflow preventer on the hose. They tend to stick them up under the sink or behind the shower wall. And a pressure regulator is always a good idea on the BT flush also.
__________________
2014 Raptor RP300MP w/ Rear Patio Party Deck, Folding Side Ladder, 6 Point Level Up, Carlisle Radial Trail HDs
2004 2500HD D/A CC SB - TTT Mirrors, Prodigy BC, 18K Pullrite Superglide, NEW Fuel Injectors 11/2015 (ouch)
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07-10-2017, 06:19 AM
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#5
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,985
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Here is a picture of the FRAGILE plastic anti-siphon valve that's located under your sink. It's way up high, probably behind the sink and very near the fittings that connect the faucet to the hot/cold water supply tubes.
That anti-siphon valve is, in my opinion, the weakest link in the trailer's entire plumbing system. It's made of plastic, doesn't survive freezing, won't stand up to high pressure use, won't make it through the winter unless removed and dried (or RV antifreeze is used to flush all water from the device).
I think you'll find the source of your water isn't the "black tank flush" but rather the "black tank anti-siphon valve".
Many have simply removed it, used two right angle fittings and a 1/2" plastic nipple to create a "bypass". Most of them also added an anti-siphon valve outside their trailer at the black tank flush fitting. Others have adapted a more "robust" brass anti-siphon valve to replace the cheap plastic one. Whatever you do will be an improvement over the current "almost $50" plastic junk.
I've also added a "block diagram" of the black tank flush system to more fully depict how the system is laid out in your trailer.
__________________
John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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07-10-2017, 12:06 PM
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#6
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Member
Join Date: Feb 2017
Location: Checotah
Posts: 52
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If the black tank is vented through the roof then what is the point of the valve? I can't understand why the flush water can't be allowed to just spray into the tank. Is it supposed to prevent the water, or whatever else, from coming backwards through the flush plumbing?
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2016 Keystone Laredo 5th wheel, 297SRE Andersen Ultimate
2002 Silverado Crew Cab, Duramax, Allison, 4x4
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07-10-2017, 12:10 PM
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#7
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Senior Member
Join Date: Jul 2014
Location: Nevada
Posts: 2,695
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Quote:
Originally Posted by NealBlue
If the black tank is vented through the roof then what is the point of the valve? I can't understand why the flush water can't be allowed to just spray into the tank. Is it supposed to prevent the water, or whatever else, from coming backwards through the flush plumbing?
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Prevents reverse flow that would contaminate the fresh water source/supply. Confidence inspiring with such a cheap back flow preventer...
__________________
Desert185 🇺🇸 (Retired Chemtrail vendor)
-Ram 2500 QC, LB, 4x4, Cummins HO/exhaust brake, 6-speed stick.
-Andersen Ultimate 24K 5er Hitch.
-2014 Cougar 326SRX, Maxxis tires w/TPMS, wet bolts, two 6v batts.
-Four Wheel 8' Popup Camper.
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07-10-2017, 07:32 PM
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#8
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Junior Member
Join Date: Feb 2017
Location: Albuquerque
Posts: 23
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Thank you everyone for the great detail in your replies! Much appreciated! JRTJH, thank you for the pictures as it makes sense to me now as to what happened. My 5th wheel is brand new, so I wonder if dealer would replace with a brass valve, but then I think it would be easy for me to do it instead of my 5th wheel sitting at the dealer for at least a month due to the busy season.
__________________
2015 Chevrolet Silverado 2500HD Duramax
2017 Cougar Xlite 28RDB
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07-10-2017, 07:35 PM
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#9
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Junior Member
Join Date: Feb 2017
Location: Albuquerque
Posts: 23
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Quote:
Originally Posted by Desert185
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I have always used a regulator for the potable water but never for the black. Lesson learned and will get a second one now! Thank you Sir!
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07-10-2017, 08:03 PM
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#10
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Junior Member
Join Date: Feb 2017
Location: Albuquerque
Posts: 23
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Also what does the bottom here mean in caps?
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07-10-2017, 08:30 PM
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#11
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,327
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The fitting you attach your city water too has a one way valve in the center. If you take the screen/washer out it looks like a button in the center.
If there is pressure in the water system, it will spray back at you and can put the valve " off center" so it won't seal. It's important that it seals when not hooked up to city water and running the water pump.
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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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07-11-2017, 06:36 AM
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#12
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Senior Member
Join Date: Jan 2014
Location: Tidewater Area Virginia
Posts: 1,271
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Quote:
Originally Posted by JDZO6C5
Also what does the bottom here mean in caps?
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To expand on what chuckster said above, the little cheap plastic city water check valve is very delicate and can be very easily broken (kind of like the black tank vacuum breaker). I had one break all by itself in the middle of the night with the pump on and it proceeded to pump 80 gallons of water from the tank into the basement. I suggest not messing with it unless it IS broken.
Edit - I guess I should add that I have a small hand pump I pump antifreeze into the city water inlet so it gets winterized, too. They are suggesting that you just push the valve in to drain the water left in that part of the system, usually not much at all. That may, or may not, work sufficiently to keep the valve from freezing.
__________________
2014 Raptor RP300MP w/ Rear Patio Party Deck, Folding Side Ladder, 6 Point Level Up, Carlisle Radial Trail HDs
2004 2500HD D/A CC SB - TTT Mirrors, Prodigy BC, 18K Pullrite Superglide, NEW Fuel Injectors 11/2015 (ouch)
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07-12-2017, 02:18 PM
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#13
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Senior Member
Join Date: Aug 2011
Location: California
Posts: 129
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Well, all this talk about the vacuum breaker/check valve in the black tank flush system caused mine to get jealous and quit. Mine was located right behind the hose bib on the wall. No service, no wake, just an unceremonious burial in the trash bin.
__________________
Central Calif.
2010 Dodge 2500HD, 5.7 hemi
2007 Cougar 244rls
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07-13-2017, 07:34 AM
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#14
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Senior Member
Join Date: Jan 2014
Location: Winnipeg, Canada
Posts: 1,196
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Black tank flush
Quote:
Originally Posted by JDZO6C5
The flush on this cougar isn't very strong it seems compared to my last camper.
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Many of us have found the ptex line for the black tank flush kinked and requiring a repair with the installation of an elbow. In our case, the kinked line was below the water inlet and visible by removing the comoplast.
Sent from my iPhone using Tapatalk
__________________
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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07-15-2017, 02:53 PM
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#15
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Junior Member
Join Date: Feb 2017
Location: Albuquerque
Posts: 23
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So today was the first time I got back into the 5th wheel to check out this vacuum flusher check valve under the bathroom sink where the water was coming from. I didn't get the time to troubleshoot it when the leak occurred. I just stopped the water, wiped up the water on floor and left it at that. So I was checking out this check valve and it turns out it was loose! One full turn and it was completely detached from the water line. Based on this, I'm guessing that it may not be broken, so I just tightened it up and hoping next time around it won't leak again, but I will definitely have my eye on it and get an extra set of hands to turn on or shut the water off when I use the flush next.
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07-15-2017, 02:57 PM
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#16
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Junior Member
Join Date: Feb 2017
Location: Albuquerque
Posts: 23
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Another question, this was right next to this valve and it appears loose as well should this stay the way it is or should it be tightened?
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07-15-2017, 03:12 PM
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#17
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,327
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That's the vent for the sink. It's okay if it's loose, as long as it's threaded enough not to leak gases.
__________________
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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07-15-2017, 03:24 PM
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#18
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Site Team
Join Date: Mar 2011
Location: Gaylord
Posts: 26,985
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You probably found your leak, tighten the anti-siphon valve fittings and always ALWAYS use a pressure regulator with the black tank flush system. That fragile plastic fitting will "self destruct" if you "slam it with full pressure" from a city water supply source, so use a regulator and always turn on the water slowly so you don't "hammer" the internals....
The other picture you posted is a "cheater vent" that allows your sink to drain without gurgling. If it's not securely screwed into the drain line you can hand tighten it but don't overtighten it. There is no water in that part of the drain lines. The only purpose for that vent is to allow air into the system so the water will drain without the gurgles.
__________________
John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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07-15-2017, 05:20 PM
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#19
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Senior Member
Join Date: Oct 2016
Location: Commerce Twp, Mi
Posts: 1,002
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__________________
TOM
2011 Chevy Silverado
1500, HD Tow Package
2017 Keystone Hideout 177LHS Carlisle Radial HDs
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07-15-2017, 06:09 PM
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#20
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Site Team | Emeritus
Join Date: Dec 2015
Location: Kansas City
Posts: 3,878
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Quote:
Originally Posted by CrazyCain
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Trailer for sale. Never smoked in. Never pooped in. Almost like new! $27,000 new. Asking $30,000 for pristine condition. Serious inquiries only.
Sent from my SAMSUNG-SM-N910A using Tapatalk
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Chip Bruce, RPh
Kansas City, MO
2016 Impact 312
2017 Silverado 3500HD SRW
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