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Old 09-19-2021, 11:37 AM   #1
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Black tank flush...

Dumped tank today and tried to rinse out but rinse is not letting water into tank to do the job any ideas on where to start trouble shooting.When I turn water on it sounds like it will work but no water out of the tank outlet.
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Old 09-19-2021, 02:38 PM   #2
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Originally Posted by gegetit View Post
Dumped tank today and tried to rinse out but rinse is not letting water into tank to do the job any ideas on where to start trouble shooting.When I turn water on it sounds like it will work but no water out of the tank outlet.
Well,
Your sig states an '18 Winnebago, correct? I'm assuming by "...tried to rinse out.....", you mean you tried to use the Black Tank Flushing fitting that's in the wet bay? If so, and you've hooked a garden hose to that black tank flush fitting and, turned the hose on and you don't hear water spraying into the black tank, correct? May I ask, what do you mean by: "it sounds like it will work?"

If you're having the problem I think you're having, I had the same exact situation several years ago on ours. Ours is an '04 Itasca Horizon 36GD with the CAT C-7 330HP and, I went to flush out our black tank one day while at home and, nope, no water entering the black tank. At least on ours, there are no valves to turn to allow for water to enter that black tank. Once you turn on water on in that hose, it's flowing into that tank.

But, if the water is on, and you have no valves to actually turn, to allow that water into the black tank flushing system to work, then you have the same problem I had. Winne and Itasca built into that black tank flush system, both a check valve and a vacuum breaker. The morons who designed my system, installed both of those right together, INSIDE A WALL, behind my toilet. There was no way to get to either of those components, without tearing the paneling right off the wall, either on the toilet room side or, the other side of the wall, in the living room.

It sounds as if one or the other of those two valves, are locked up and not allowing water to flow freely, from the garden hose connection in your wet bay, to the inside of the black tank.

You'll have to dig into the plumbing drawings that you can find for your coach, normally in a sticky in the front of the Winnebago Owners Forum. If you find you have those two components in your black tank flushing system, you'll have to determine how to get to them. Hopefully it's not like what I had to go through to get to mine. Let us know what you find.
Scott
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Old 09-21-2021, 03:41 PM   #3
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gegetit, if the water pressure going into the black tank rinse is to high the back flow preventer will slam shut and stop the water flowing into the tank. I have a cheap hose valve on mine so i can control the flow.
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Old 09-21-2021, 06:49 PM   #4
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Either the back flow device is stuck, jammed or got trash in it. This you should be able to access from either the basement of possibly the bathroom sink. Other problem can be trash in spray nozzle. For this yo will need to access the side of the tank to pull the nozzle and clean it out.

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Old 10-05-2021, 04:06 PM   #5
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Well,
9-19 to 10-5 and there's been no reply. Guess he's not too concerned with answers. Oh well.
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Old 10-05-2021, 04:24 PM   #6
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Well,
9-19 to 10-5 and there's been no reply. Guess he's not too concerned with answers. Oh well.
Scott
Yeah well with any luck he found the problem and didn't think to give us a reply.
My flushing difficulty was when I parked the coach so as it was leaning the wrong way. Nothing came out. No black, no grey, no rinse. Nothing. Then the brain cells finally fired a couple of times and I turned the coach around and everything worked like it should.
Maybe our friend had the same problem.
Stan
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Old 10-05-2021, 05:40 PM   #7
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Blak water flush

I had same problem on 2013 Tour. Valve is near half bath sink. Can see it from cabinet. I went ahead and bought replacement valve. But tapped the original valve AND do not use full force water pressure. Working ever sense. Don’t think I needed to tap it. Good luck
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Old 10-05-2021, 06:25 PM   #8
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Vista 29VE 2019 Black tank overflowed while cleaning

I have a slightly different black tank issue. I got home after 11 weeks and emptied the black tank into my sewage field. I used a tank rotating attachment into the toilet to knock loose material and filled the tank most of the way. Drove and then dumped. No joy tank still indicated 2/3rd full. So I filled with black tank water again adding dish detergent and using the rotating attachment to hopefully detach whatever was causing the incorrect reading. The water got almost to the top of the pipe into the toilet. I went outside to turn the water off and noticed water coming out of my RV. (thankfully the water was clean as it was the second filling of clean water.) I shut off the water and dumped. I filled the filled tank again while my spouse watched for the leak. Water started coming out when the black tank read full. The water was not far up the pipe. Dumped again called my RV service to make an appointment. The manager said was most likely the seal but some black tanks have a flexible seal which if the tank is overfull could leak.
Q: Has anyone had experience with this issue?
Q: Is the black tank seal static/solid or flexible?
Q: If a static seal what is the cost to replace it?
Q: If a flexible seal should it be replaced? What is the cost to replace?
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Old 10-07-2021, 06:59 AM   #9
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same issue with 2021 winnie 26T

I had the same problem with the black tank with our 2nd time flushing out the black tank. With the tank on the opposite side of the mh the handle is very difficult to pull and push so thinking it might not be fully out i pulled and pushed a few times and suddenly out came a round of insulation with the woosh of water. Our gauge still constantly reads 2/3 full.

I still have a hard time, even after lubing the cable to get the tank to open and close. But it does rinse when we dump. I would love to go to the dealer for a fix but the dealer in General is NOT helpful, as with several other issues.
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Old 10-07-2021, 08:16 AM   #10
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Yeah well with any luck he found the problem and didn't think to give us a reply.
My flushing difficulty was when I parked the coach so as it was leaning the wrong way. Nothing came out. No black, no grey, no rinse. Nothing. Then the brain cells finally fired a couple of times and I turned the coach around and everything worked like it should.
Maybe our friend had the same problem.
Stan
I don't see how this could have been possible. Sure, the tanks might not drain completely but it doesn't sound plausible to not have any flow? How unlevel was the rig? And how would the un-levelness of the RV have anything to do with the tank flush? Or,,, what am I missing?
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Old 10-07-2021, 09:40 AM   #11
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I don't see how this could have been possible. Sure, the tanks might not drain completely but it doesn't sound plausible to not have any flow? How unlevel was the rig? And how would the un-levelness of the RV have anything to do with the tank flush? Or,,, what am I missing?
I actually think you do get it, the rv was too far out of level.


Holding tanks have a sloped bottom so all contents flow to the drain when the tank is level. You know this. The degree of slope, however, is different for every tank manufacturer so the degree to which a tilt of the RV will affect flow is also different. Further, a RV can be tilted away from the drain in two directions, pooling the contents in a corner of the tank. Under those conditions, it will take a lot of filling for water to eventually flow out of the drain opening.
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