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Old 08-04-2019, 01:49 PM   #1
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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.
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Old 08-04-2019, 01:56 PM   #2
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Was your black tank emptying valve open???
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Old 08-04-2019, 02:07 PM   #3
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Originally Posted by keegantimber View Post
Was your black tank emptying valve open???
No, I wanted the tank to fill a bit before I dumped it.
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Old 08-04-2019, 02:35 PM   #4
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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
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Old 08-04-2019, 02:50 PM   #5
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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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Old 08-04-2019, 03:20 PM   #6
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In my 5th wheel it is behind the shower valves. Possibly same in your TT.
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Old 08-04-2019, 03:21 PM   #7
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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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Old 08-04-2019, 04:28 PM   #8
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Originally Posted by Chascin View Post
In my 5th wheel it is behind the shower valves. Possibly same in your TT.
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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Old 08-05-2019, 08:50 AM   #9
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Originally Posted by itat View Post
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
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.
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Old 08-05-2019, 08:57 AM   #10
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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...






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Old 08-05-2019, 10:04 AM   #11
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So...what was the black tank level BEFORE you started the flushing with the emptying valve closed?
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Old 08-05-2019, 10:29 AM   #12
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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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Old 08-05-2019, 11:44 AM   #13
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Quote:
Originally Posted by Theo View Post
So...what was the black tank level BEFORE you started the flushing with the emptying valve closed?
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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Old 08-05-2019, 12:04 PM   #14
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Quote:
Originally Posted by 5picker View Post
The original post indicates less than 1/4 full.
Hmmm, according to the notoriously unreliable sensors?
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Old 08-05-2019, 12:09 PM   #15
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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.
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Old 08-05-2019, 12:13 PM   #16
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Quote:
Originally Posted by karrun View Post
Hmmm, according to the notoriously unreliable sensors?
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.
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Old 08-05-2019, 01:48 PM   #17
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Quote:
Originally Posted by 5picker View Post
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...






Do you remember where you got your brass valve or what brand and model it was?
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Old 08-05-2019, 02:22 PM   #18
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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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Old 08-05-2019, 02:26 PM   #19
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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.
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Old 08-05-2019, 03:04 PM   #20
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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!
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