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Old 08-18-2018, 11:56 AM   #1
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Black tank dump valve

2017 Jayco SLX 245RLSW

Ongoing problem since new. It's time to do something.

Can't take it back to the dealer.......I am deep in Baja Mexico and a 1000 miles away.

The black tank drain volume is just a trickle....even after 30 days of use.
No paper has EVER been deposited and less than 4 "emergency" consistancy loads since brand new.

Nightly liquid deposits during this last 30 day period, with every other time flush.

Gauge says "full" with all 4 lights lit up. Started out from 3 lights.

On draining, the flow is a trickle.....while the gray was full on flow and empties well.
First go round was trailer level.......second attempt the drain side was down a bit. Still weak but a tad better.

Push/pull handle for the valve seems to operate ok.

Looking for help for a solution to the trickle drain.

Layman guess would be the valve is not opening fully, or construction debris is blocking the flow
Solids build up is a non factor.....not enough deposits to make that a concern and always with copious amounts of water first and after......with chemicals.
No paper ever.....

What say you?
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Old 08-18-2018, 01:46 PM   #2
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It seems you are saying the black tank seems to drain fully, it just takes too long, correct? If that's true, could the fix wait until you're back in the US?

On the other hand...
Can you use a flashlight to look down through the toilet and see the level in the black tank? Could you drain the tank and lower a video camera (tape a cell phone to a stick and make a movie) and look around?
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Old 08-18-2018, 02:17 PM   #3
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Oldman.......

No the tank does not drain completely....the best I can reckon.
The flow slows to nearly nil and by all manner of common sense, way less volume that what has been put in.

Idiot light gauge shows 2/3rds full after the dump.

Comparing the flow from the gray, which is a full flow torrent, the black flow is lacking big time.....a trickle by comparison.

I will do the flashlight thing when I get back up the line 250 miles where the trailer is waiting my return.

I have some digesting chemical on order and will give that a go soon.

Thank you
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Old 08-18-2018, 02:27 PM   #4
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You can check the tank with a camera if you have one, if not it is cheap to invest in one. (a dealer charges you $$$). Black liquid is thicker than gray liquid, means the flow will be slower. Tank monitors are useless for the gray and black tank.
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Old 08-18-2018, 03:24 PM   #5
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Quote:
Originally Posted by ALJO View Post
You can check the tank with a camera if you have one, if not it is cheap to invest in one. (a dealer charges you $$$). Black liquid is thicker than gray liquid, means the flow will be slower. Tank monitors are useless for the gray and black tank.

Now to convince a buddy of mine to stick his $$$ phone/camera down a dark and black hole full of goo.
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Old 08-18-2018, 03:36 PM   #6
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If you've been filling up the blank tank with mostly liquid and its only trickling out, you have some obstruction. No easy way to go about it. If I had a coat hanger I'd try putting in the pipe and see what I could do. Over course if you free it up, better have enough water for a shower and a decent place for it to drain..

Other than that, perhaps call a septic tank guy or a plumber. Both may have cameras to shoot up there and see whats happening and the septic guy has a vacuum to try and clear the blockage.
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Old 08-18-2018, 04:21 PM   #7
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Quote:
Originally Posted by mini4mw View Post
If you've been filling up the blank tank with mostly liquid and its only trickling out, you have some obstruction.
Yes this is the scenario........

And it's been this way since new......I suspect some construction debris has the exit blocked up, so it's just a trickle.

Do you or anyone, know how far up inside that drain pipe I could get a wire or hose or other implement to dislodge a blockage?

And for the offhand chance of someone knowing the OEM size of the valve itself?.....like I mentioned......the unit is 250 miles from me right now.
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Old 08-19-2018, 02:09 PM   #8
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I believe the standard size is 3", but that's just memory/visual guess as mine is in storage. All the ones I've seen the toilet drops straight into black and there's a pipe off one end of the tank itself to the release valve. No real turns to get stuck on.

A hanger should tell you if the valve is opening all the way. It's probably just 1 slight turn before getting to the tank. I wonder if the valve isn't opening more than an obstruction. It would have to be pretty big to not let water out when the tank is full (water pressure).

I wonder if you twist the black tank release handle would screw into the slider in the valve? Or give the handle a string push closed to snap into valve slider? . Perhaps just not connected and when you pull it the slide opens just a crack by releasing the handle?
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Old 08-19-2018, 02:25 PM   #9
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Redsnapper; I was talking about an inspection camera, plumbers use it all the time. Those camera's are handy for everything in nooks of your RV or home, truck etc.

If your handle is fasten to the gate valve sometimes it takes a good pull when the seal is very dry. Many tanks are designed so that the discharge of the tank is right close to the inlet flange where the toilet sits on. Once your tank is empty you can expect easy. Main thing is your valve has to be open (handle extended all the way.
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Old 08-19-2018, 09:35 PM   #10
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Have you checked to make sure your gate valve is opening?? The handle on mine broke and had to be replaced. The valve is basically a flat piece of plastic or metal that slides open or closed in a track.
Google "rv gate valve repair" several YouTube on how they work and how o repair them. Could also be construction debris in the pipe blocking the valve.

If you up for a bath of nasty push the cleanout hose at the rv dump station up the pipe with water running. If it won't go past the valve then the valve may be broken
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