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08-04-2019, 01:49 PM
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#1
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Senior Member
Join Date: Jan 2019
Location: Reno, NV
Posts: 1,713
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black tank flush isnt flushing
I hooked up a short garden hose to the black tank flush fitting on the back, exterior wall of my TT and turned on the water. I was hoping the inside of my black tank would self-clean, instead I ended up flooding the floor of my TT with water.
Did I do something wrong?
The black tank was less than 1/4 full when the cleaning was attempted.
This was the first time I used this "feature" and it was not checked during the PDI back in February.
__________________
2018 Ram 2500 Tradesman, CTD/CC/SB/4X4/Equalizer WDH
2019 Forest River Surveyor Legend 19BHLE
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08-04-2019, 01:56 PM
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#2
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Member
Join Date: Feb 2018
Posts: 73
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Was your black tank emptying valve open???
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08-04-2019, 02:07 PM
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#3
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Senior Member
Join Date: Jan 2019
Location: Reno, NV
Posts: 1,713
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Quote:
Originally Posted by keegantimber
Was your black tank emptying valve open???
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No, I wanted the tank to fill a bit before I dumped it.
__________________
2018 Ram 2500 Tradesman, CTD/CC/SB/4X4/Equalizer WDH
2019 Forest River Surveyor Legend 19BHLE
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08-04-2019, 02:35 PM
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#4
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Canadian Member
Join Date: Feb 2012
Location: Eastern GTA, Ontario, Canada
Posts: 6,233
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I suspect that the vacuum breaker/check valve sprung a leak. It’s frequently located under the bathroom sink. It looks like this.
https://www.amazon.com/JR-Products-5...81563002&psc=1
Mine started leaking recently so I replaced it with a Watts brass LF288A but you can also just replace the black plastic junk with a 90 degree fitting and use a 3/4” hose bib vacuum breaker valve outside.
https://www.homedepot.com/p/Everbilt...-205815672-_-N
__________________
2023 Rockwood Signature 8262RBS
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed
2019 Rockwood Signature 8290BS (2019 - 2022)
2011 Rockwood Signature 8293SS (2015 - 2018)
2010 Rockwood Roo 23SS (2012 - 2014)
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08-04-2019, 02:50 PM
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#5
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Member
Join Date: Sep 2018
Posts: 58
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Good luck finding your check valve. I haven't found mine yet!!! I guess my next step is to start pulling wall panels to try and locate it.
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08-04-2019, 03:20 PM
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#6
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Senior Member
Join Date: Apr 2018
Location: St. Louis, MO
Posts: 112
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In my 5th wheel it is behind the shower valves. Possibly same in your TT.
__________________
Charlie & Cindy
2022 Duramax 3500 cc sb
2017 Wildcat 32 WB
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08-04-2019, 03:21 PM
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#7
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Senior Member
Join Date: Jul 2017
Location: Georgia
Posts: 581
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I always drain my black tank before doing the flush. Id fill the tank via the toilet to 3/4 +/- via the toilet before draining to get a good initial dump. Then with dup valve open, start the flush. Use a water pressure regulator on this flush line too.
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08-04-2019, 04:28 PM
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#8
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Member
Join Date: Sep 2018
Posts: 58
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Quote:
Originally Posted by Chascin
In my 5th wheel it is behind the shower valves. Possibly same in your TT.
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I screwed the access door open and couldn't find it in there. There is a corner in the commode closet that has a panel in it, I'm thinking about prying it open to see if it is behind it.
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08-05-2019, 08:50 AM
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#9
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Senior Member
Join Date: Jan 2019
Location: Reno, NV
Posts: 1,713
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Quote:
Originally Posted by itat
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Thanks, I have that black vacuum break check valve under my bathroom sink, I will check to see if that is where the leak is.
I turned the water off after I noticed the flood,I didn't check to see where the origin was.
__________________
2018 Ram 2500 Tradesman, CTD/CC/SB/4X4/Equalizer WDH
2019 Forest River Surveyor Legend 19BHLE
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08-05-2019, 08:57 AM
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#10
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,074
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Usually located by the bathroom sink or shower.
They are often bad right from the factory and leak, won't pass water or installed backwards. (cheap)
Get a brass one. Note flow direction when installing.
Will look like these...
__________________
2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2017 Ford F-Series SCREW 4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
F&AM Lodge 358 Somerset, PA - JAFFA Shrine - Altoona, PA
Days Camped ☼ '19=118 ☼ '20=116 ☼ '21=123 ☼ '22=134 ☼ '23=118☼ '24=86
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08-05-2019, 10:04 AM
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#11
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Retired Panpsychist
Join Date: Jul 2016
Location: Western Massachusetts
Posts: 1,042
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So...what was the black tank level BEFORE you started the flushing with the emptying valve closed?
__________________
Theo & Carol
2007 GoldenDoodle ("Cooper") R.I.P.
2020 Rockwood Roo 23IKSS
2015 F-150 4WD XLT SCab, 5.0L, 3.73, 36gal, HD Towing Pkg (53A), 1,980lb Payload
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08-05-2019, 10:29 AM
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#12
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Senior Member
Join Date: Jul 2017
Location: Georgia
Posts: 581
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I am a bit lost on this one. Would have thought a Black Tank Flush would be a line directly from the flush connect to the black tank. Why would there be a check valve on a black tank flush line? Where/what is the check valve stopping the black water flush from flowing in to?
NEVER MIND... FOUND THE ANSWER.
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08-05-2019, 11:44 AM
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#13
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,074
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Quote:
Originally Posted by Theo
So...what was the black tank level BEFORE you started the flushing with the emptying valve closed?
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The original post indicates less than 1/4 full.
Quote:
...snip...
The black tank was less than 1/4 full when the cleaning was attempted.
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__________________
2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2017 Ford F-Series SCREW 4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
F&AM Lodge 358 Somerset, PA - JAFFA Shrine - Altoona, PA
Days Camped ☼ '19=118 ☼ '20=116 ☼ '21=123 ☼ '22=134 ☼ '23=118☼ '24=86
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08-05-2019, 12:04 PM
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#14
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Senior Member
Join Date: Jan 2015
Location: Chicago Western Burbs
Posts: 508
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Quote:
Originally Posted by 5picker
The original post indicates less than 1/4 full.
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Hmmm, according to the notoriously unreliable sensors?
__________________
2016 Roo 21SS
2005 Ford Excursion-Sherman
Mods so far:
PI hardwired EMC, Wire Shelving in wardrobe
Plexiglass screen door protector, Blue LED Wine nook
stairs, and counting...
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08-05-2019, 12:09 PM
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#15
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Canadian Member
Join Date: Feb 2012
Location: Eastern GTA, Ontario, Canada
Posts: 6,233
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Here is a picture of my brass replacement. I used a couple brass close nipples since the valve has female threads. The plastic screw on fittings have O rings so I didn’t use any teflon tape on that side of the nipples.
__________________
2023 Rockwood Signature 8262RBS
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed
2019 Rockwood Signature 8290BS (2019 - 2022)
2011 Rockwood Signature 8293SS (2015 - 2018)
2010 Rockwood Roo 23SS (2012 - 2014)
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08-05-2019, 12:13 PM
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#16
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Pickin', Campin', Mason
Join Date: Aug 2015
Location: South Western PA
Posts: 19,074
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Quote:
Originally Posted by karrun
Hmmm, according to the notoriously unreliable sensors?
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I have no clue?
Maybe from looking down through the toilet bowl?
The OP also indicated they flooded their floor with 'water'.
You're certainly welcome to come to whatever conclusions you want.
__________________
2022 Cedar Creek 345IK 5th Wheel•Solar & Inverter•2017 Ford F-Series SCREW 4x4•Factory Puck•B&W Companion•TST Tire Monitor w/Repeater•Sinemate 3500w Gen.
F&AM Lodge 358 Somerset, PA - JAFFA Shrine - Altoona, PA
Days Camped ☼ '19=118 ☼ '20=116 ☼ '21=123 ☼ '22=134 ☼ '23=118☼ '24=86
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08-05-2019, 01:48 PM
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#17
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Senior Member
Join Date: May 2017
Location: Southeast
Posts: 1,047
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Quote:
Originally Posted by 5picker
Usually located by the bathroom sink or shower.
They are often bad right from the factory and leak, won't pass water or installed backwards. (cheap)
Get a brass one. Note flow direction when installing.
Will look like these...
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Do you remember where you got your brass valve or what brand and model it was?
__________________
2018 Forest River Rockwood Roo
24WS
2019 Ford SD F-350 SRW Lariat
Tow & Gooseneck Prep
FX4 Off Road (4X4)
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08-05-2019, 02:22 PM
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#18
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Member
Join Date: May 2013
Location: Georgia
Posts: 62
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Probably the check valve. It could be located anywhere. Mine was located behind the entertainment center in my Sandpiper 5th wheel. I had to remove the sub woofer to get to it. Good luck!
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08-05-2019, 02:26 PM
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#19
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Senior Member
Join Date: May 2017
Location: Southeast
Posts: 1,047
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Check valves are usually located near a water pipe source... one under kitchen sink, one under bathroom sink, behind a panel near shower or toilet. But nothing is guaranteed. They put them wherever the engineers said was easiest to install in the build and not the easiest to access after it's all buttoned up. An RV is your lifelong continuing education. Only credit you get on this education is credit for passing along your experienced information to others.
__________________
2018 Forest River Rockwood Roo
24WS
2019 Ford SD F-350 SRW Lariat
Tow & Gooseneck Prep
FX4 Off Road (4X4)
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08-05-2019, 03:04 PM
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#20
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Retired Panpsychist
Join Date: Jul 2016
Location: Western Massachusetts
Posts: 1,042
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Just a personal observation: Anyone who has owned a 60s or 70s British or Italian sports car and has kept it on the road for 5+ years him/herself is a good candidate for RV ownership!
__________________
Theo & Carol
2007 GoldenDoodle ("Cooper") R.I.P.
2020 Rockwood Roo 23IKSS
2015 F-150 4WD XLT SCab, 5.0L, 3.73, 36gal, HD Towing Pkg (53A), 1,980lb Payload
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