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Old 05-25-2020, 03:54 PM   #1
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Exclamation Black tank full, not draining - HELP!

We have a new (2019, bought March 2020) Cherokee 264ck. For background, my son is living in it full time with his family, 3 adults using the bathroom. Been lived in since March 5 2020, never had a problem dumping before. Always dump when tank is over 2/3 full. If we had a tow vehicle, we'd try moving it, but we don't. Plus getting it into it's spot and blocking it up was not easy, even with a professional from the dealership helping.

The tank is full now, but when we open the valve to dump the tank, nothing substantial comes out, just a trickle of water, then nothing. We've added some soap, hoping that might help. Open to any advice on this. It's the only bathroom on the property, so we need to solve this soon.

HELP!
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Old 05-25-2020, 04:15 PM   #2
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That probably have a poo pyramid, from not using enough water.
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Old 05-25-2020, 04:22 PM   #3
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Are you sure the drain valve is opening completely? If so I suspect there has not been enough water used when flushing the toilet and you have solids built up in the tank.

If so, open the valve, then pour a bucket of water down the toilet, repeat until you get a good flow out of the drain or until the water level in the tank reaches the bottom of the toilet. If the water gets up to the toilet, dump in about a triple dose of tank chemicals and let it sit overnight then try to drain it again. If you can get the water to drain reasonably well, put water down the toilet until it runs clear, close the valve, put about 1/3 of a tank of water in along with a good dose of chemicals and be sure to use plenty of water when you flush. The water is needed to be sure the solids break down so they will flow out when you open the drain valve on the tank.
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Old 05-25-2020, 04:27 PM   #4
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Sometimes when they cut the circle of plastic out of the tank for the toilet, it falls into the tank. If they don't get it out, it eventually works it way to the drain and clogs it up. There are a number of posts regarding this issue.

May or may not be your issue. You might try blasting some water backwards up the drain with one of these:



If that's your problem, it may move it out of the way, but until you can remove it completely, you'll always be susceptible to the problem.
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Old 05-25-2020, 04:29 PM   #5
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just guessing, but would opening and closing the valve several times help by getting to move bit so that the liquid portion would drain? i have had times when something clogged the drain and by moving the drain a few times it broke the clog free. other than that yu need to get something into the tank to dissolve the clog.
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Old 05-25-2020, 04:46 PM   #6
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For what its worth, the gauge is notoriously faulty and will tell you it's full when it's not. Maybe its not full at all. If so, just wait until the sound changes when flushing before you dump. If you're sure it's full and not draining, I'd go with the other advice.
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Old 05-25-2020, 04:53 PM   #7
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Hope no one used wipes!
If you open the valve inside and look down with a flashlight you might see what's up. If it curves into the tank, I would try a bucket of hot water to flush down.
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Old 05-25-2020, 05:16 PM   #8
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Quote:
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Hope no one used wipes!
Yep, definite possibility.
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Old 05-25-2020, 05:35 PM   #9
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One time I couldn’t get a gray tank to drain. My valve wasn’t opening. Why? The end of the cable slide wire (frame right) had come out from under the set screw on the valve mechanism (frame left).
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Old 05-25-2020, 10:54 PM   #10
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The anti-siphon valve setup looks like something worth having around anyway. We did get the tanks to drain for now though.
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Old 05-25-2020, 11:19 PM   #11
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I want to than everyone for their help and suggestions. No wipes, they know better than to put anything but toilet paper in there. And fortunately, the problem wasn't from any debris left over from construction, though that wouldn't be unrealistic given the way they build these. Best guess is the Northern Quilted TP, bought in haste because the covid hoarders had taken everything else, was just too thick. Fortunately we snagged an economy sized pack of Scott 1-ply today, won't use the Northern again, unless the hoarders once more clean out all the 1-ply. If that happens, we'll be sure to flush 2-3 times every time the toilet is used.

I still owe this forum for this solution dug out of the archives:

"It had something in the black tank from new and stunk horribly. It wouldn't drain. We stopped at a campground for the night wondering what to do and a campground host said fill up the gray tank and black all the way then pull both valves open at the same time.. IT WORKED!! Thank you because that smell was horrid. The grey is down line from the black and creates extra vacuum on the black tank."

So we filled both grey water tanks, then opened them both about 1 second before opening the black water valve: the suction from the grey water running down pulled the clog loose. And ran the black water flush for a good long time after, to clear it out good. We may just fill the black water tank again by running a hose into the toilet, and dump again, to be extra sure of clearing out anything left in there.

Everyone, thank you again.
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Old 05-26-2020, 10:40 AM   #12
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Glad to hear you got it cleared. That curved sewer attachment for a hose, I put a gate attached to the going away side. I close it, turn on the water and open the black valve. You must pay attention and not do anything else. I may do this several times, but its a surprise what comes out each time you open the gate valve. I do the same with the gray tank but no where's near as often.
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Old 05-26-2020, 10:45 AM   #13
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Three adults full timing is quit a strain on your black tank!
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Old 05-26-2020, 10:48 AM   #14
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Quote:
Originally Posted by justanotherrvr View Post
I want to than everyone for their help and suggestions.

"It had something in the black tank from new and stunk horribly. It wouldn't drain. We stopped at a campground for the night wondering what to do and a campground host said fill up the gray tank and black all the way then pull both valves open at the same time.. IT WORKED!! Thank you because that smell was horrid. The grey is down line from the black and creates extra vacuum on the black tank."

So we filled both grey water tanks, then opened them both about 1 second before opening the black water valve: the suction from the grey water running down pulled the clog loose. And ran the black water flush for a good long time after, to clear it out good. We may just fill the black water tank again by running a hose into the toilet, and dump again, to be extra sure of clearing out anything left in there.

Everyone, thank you again.
Good tip. later RJD
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Old 05-26-2020, 01:19 PM   #15
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try disposing the wipe paper in a small trash can lined with a plastic bag...

toss the plastic bag later and don't put any paper into the black tank...
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Old 05-26-2020, 01:38 PM   #16
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Instead of bringing a hose inside I use 2 _1 gallon water bottles to hold the pedal open . Then you can fill it until it starts up into the bowl. Then you don't have to run outside to stop the water.
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Old 05-27-2020, 08:03 AM   #17
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Use waste digester in between dumps. Keeps everything broken up for easy dumping. You can get it anywhere.
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Old 05-27-2020, 11:11 AM   #18
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try disposing the wipe paper in a small trash can lined with a plastic bag...toss the plastic bag later and don't put any paper into the black tank...
That's our SOP. No chemicals. No paper. Lots of water. No problem.
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Old 05-27-2020, 11:25 AM   #19
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I use RV Digest It in my black water tank. It says on the bottle, if I remember correctly, to use a whole bottle in case of a poo mound and let it sit for 24 hours with as much water as you can put in the tank and the mound is supposed to dissolve in that 24 hour wait. Glad to hear you got the problem taken care of. Another pea for the Tank...er pod
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Old 05-27-2020, 11:29 AM   #20
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try disposing the wipe paper in a small trash can lined with a plastic bag...

toss the plastic bag later and don't put any paper into the black tank...
To each their own.
e
I've been putting TP in the holding tank (as well as my family) since I started RV'ing back in the early 70's. Never a clog. Gauges get fouled by just about EVERYTHING in the tanks, not just TP so nothing gained there by saving it separately.


When I fist started RV'ing an old timer clued me in. When black tank is dumped and flushed be sure to add water back to the tank so "solids" don't stick to bottom of tank in the drop zone. Add enough so you have an inch or so of water on the bottom of the tank.
I know it's counter-intuitive to put water into a tank you've just drained but it really won't impact the number of uses possible. Will definitely make the disposal process quicker..
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