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Old 02-03-2014, 04:08 PM   #1
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Black tank stoppage

I can't get my black tank to drain. Tried everything I can think of.

Generally I flush it every two days. The shower is plumbed into black, so after the second shower it's pretty full. I haven't flushed it in two weeks, cause my sewage line was frozen solid. Using the shower house. Now that the sewer line is clean, I tried to open the black valve and got nothing.

I used a plunger and a snake on it (both ends) and well as mixable of water softner and oxy clean (sounded like a good idea). Just get a slow dip.

Running a snake from the outside, I am surprised it didn't break the clog. At a lost what to do. Got cold weather in a two days, so I was hoping to have it solved by then.
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Old 02-03-2014, 04:14 PM   #2
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You don't say if the dump valve is opening...?

Is it possible the tank is frozen at the valve?

If the valve is opening, you might try back flushing to clear whatever the clog is. I'd try a fitting where you can hook up a hose to attack it from the drain side. Something like this would work. If you have any doubts about it being frozen you could use hot water on the back flush.

http://www.amazon.com/Valterra-F02-4...rv+accessories
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Old 02-03-2014, 04:25 PM   #3
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Is it frozen? You didn't say what the temperatures are. If it's ice you could try a space heater in the water bay or inside of a warm building over night. RV service center, truck garage, etc.
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Old 02-03-2014, 04:30 PM   #4
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Old 02-03-2014, 04:42 PM   #5
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What you need may be this. It will pressurize the line and may brake it free.
http://www.amazon.com/Camco-39533-Se...=pd_sim_auto_6
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Old 02-03-2014, 04:54 PM   #6
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It's not frozen. I got 15 feet of snake in from the drain side. If the snake can get in, the fluid should at least come out. Ordered the flush kit from Amazon. Wait three days to see if it works. And hope for another thaw.
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Old 02-04-2014, 06:35 AM   #7
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If you can't wait the 3 days, many WalMarts sell the flush adapter in the RV section. Let us know how it works.
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Old 02-04-2014, 09:41 AM   #8
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A trick I use sometimes when the black tank is draining slowly due to clogs is to open the black tank, then open the grey tank so the water rushes out which creates suction on the black tank and nearly every time clears the clog. Not sure if this will help you but it is worth a shot.
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Old 02-04-2014, 11:20 PM   #9
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Quote:
Originally Posted by ken90004 View Post
It's not frozen. I got 15 feet of snake in from the drain side. If the snake can get in, the fluid should at least come out. Ordered the flush kit from Amazon. Wait three days to see if it works. And hope for another thaw.
If it's not frozen, why do you need a thaw?

It's either frozen or it's clogged. If it's clogged, then the clog is either #1, paper or #2, #2. In either case, back flushing should work. If it's frozen, back flushing with hot water should work.

It could also be that the valve itself is broken. I've never seen it, but I've heard about the rod breaking free from the valve (or is this just a campground old wives tale?).

You could also call in the local Honey Bucket crew with their vacuum truck. A bit of vacuum on the clog should free it up.
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Old 02-04-2014, 11:23 PM   #10
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Oh, have you checked your vent to make sure it's clear of snow and ice (and birds nests)? That could (theoretically) create a sufficient vacuum within the tank to prevent the flow. You could prop open the toilet valve which would provide an alternate vent. Worth checking.
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Old 02-04-2014, 11:44 PM   #11
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If you are going to connect the flusher directly to you drain line that is pictured in the Amazon link, it is the wrong one. The one pictured is a male cap, you need the female cap with the hose connection pictured here Valterra Products, Inc. T1020-1 3" Black Termination Cap with Bayonet Hook and Hose Thread Connection : Amazon.com : Automotive You can adapt the male hose connection on the cap to the male hose end to flush the line. You can get the female cap with the hose connection at any RV Supply store.

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Old 02-06-2014, 11:25 PM   #12
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I had the same problem last summer. My rv tank outlet is one inch above the bottom of the tank. I'm sure TP over time stuck on the lip. I filled the black tank several times flush was slow. So I closed the valves and let the tank fill, and when the water came out of the roof vents I pulled the valve handle and got a good drain. The level showed empty. I got one of those hoses from a hardware store that seals itself under pressure.
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Old 02-28-2014, 01:43 AM   #13
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Any update to your problem? You had quite a winter adventure. Let us know how it all turned out.
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