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Old 02-19-2018, 07:31 PM   #1
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Black tank wonít drain

Hello I just went to dump my black tank in my xlr nitro 42ds5 and I won’t drain. What now? Can I use the black tank flush to try and in block what ever is blocking it. Yes we use rv paper never had this problem before. We live in this camper. Any suggestions would be great
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Old 02-19-2018, 07:38 PM   #2
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First don't use the black tank flush if you have a blockage. I have one of those clear plastic fittings for the dump connection that has a hose connection to back flow the tank to wash it out I would try that first. let the forum know what you do to clear the blockage.
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Old 02-19-2018, 08:07 PM   #3
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Also valve is hard to open
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Old 02-19-2018, 08:32 PM   #4
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Where are you and what is the temperature? Possibly frozen???
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Old 02-19-2018, 08:37 PM   #5
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I’m in Sacramento ca it did get to 30 last night but know one else is having problems around the park so I don’t think that is the problem
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Old 02-19-2018, 08:40 PM   #6
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My first thought was the temp and it being froze. I did have that issue once after a cold spell over a late weekend trip but it broke loose while at the dump station.

Hard to open? also hard to close? Is it possible the pull handle separated from the actually blade that closes off? If that was the case though I would think the handle would be in your hand?
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Old 02-19-2018, 08:42 PM   #7
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We had a blockage years ago in our old TT. When they built it and cut the hole in the top of the black tank for the toilet, they left the plastic disc in the tank. Years later it finally worked its way over to the drain and plugged on our trip. We used the device Seadog described to blast the disc back in and start the flow again. In the end I had to remove the whole valve assembly and fish (literally used an old fishing rod with a bent nail taped to the end) the disc out. HTH.
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Old 02-20-2018, 12:15 AM   #8
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I end up getting it unclogged by dumping boiling water down the tank about 3 gallons worth. I know the tank was not froze. It must have lose do up everything just enough!
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Old 02-20-2018, 02:42 PM   #9
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When they installed my black tank, they cut an opening to install the flush unit. The round plastic disc that resulted from that cut fell into thetank and plugged the drain on my first trip. I ended up using a septic pumper and got it cleared. Maybe thats your problem!
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Old 02-20-2018, 06:00 PM   #10
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Could be a vent through the roof blocked. Check to see if all roof vent caps are in place if one is missing that vent pipe could be blocked. Make sure none are obstructed with debris while up there. If possible and connected to sewer leave black valve open for an hour or so to see if drainage is slow. Another indicator of a blocked vent.
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Old 02-20-2018, 11:24 PM   #11
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Check out youtube, in the search area type in "making a tool to unclog RV toilet" and a whole host of videos will be available to make a tool out of pex to take care of this type of problem.
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Old 02-21-2018, 09:47 AM   #12
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The OP responded in post #8 that the problem has been resolved.
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Old 02-21-2018, 10:00 AM   #13
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Quote:
Originally Posted by Mattiep89 View Post
I end up getting it unclogged by dumping boiling water down the tank about 3 gallons worth. I know the tank was not froze. It must have lose do up everything just enough!
The tank itself will be the last thing to freeze. The 3" drain pipe and valve, which is "hanging out in the breeze," is the first thing to freeze. I'm guessing you froze up.
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Old 02-21-2018, 11:01 AM   #14
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Try a toilet wand ???
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Old 02-21-2018, 11:30 AM   #15
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Originally Posted by Mattiep89 View Post
I end up getting it unclogged by dumping boiling water down the tank about 3 gallons worth. I know the tank was not froze. It must have lose do up everything just enough!
Could be you are not using enough water when you flush. Water is the best friend of your black tank, use lots of water. Only dump when the tank is at least 3/4 full.
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Old 02-21-2018, 11:34 AM   #16
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Originally Posted by PhoneDude 8289 View Post
Could be you are not using enough water when you flush. Water is the best friend of your black tank, use lots of water. Only dump when the tank is at least 3/4 full.
Right On !!!
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Old 02-21-2018, 02:53 PM   #17
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The OP responded in post #8 that the problem has been resolved.
I am not sure if this was directed at my post, however, I did read that the problem was solved. The reason for my input was for any future incident, if he is living in his unit, it may happen again. This was a way for him to be prepared for the next time.
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Old 02-21-2018, 03:31 PM   #18
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Quote:
Originally Posted by PhoneDude 8289 View Post
Could be you are not using enough water when you flush. Water is the best friend of your black tank, use lots of water. Only dump when the tank is at least 3/4 full.
If you are on the road and using full hookups every night, and you only end up with 1/3 of a tank by the time you are breaking camp for the next days drive...should you dump the tank or haul it around for the day and wait until the next night to have a fuller tank?
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Old 02-21-2018, 07:39 PM   #19
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If its not a towing weight issue, I would leave it until the next night at your new location. It will slosh around a little and help break up any solids as well.

I mentioned weight issue because I am not sure how close to capacity you load your trailer, your gear, and yourselves.

If you want to dump it before you leave, you can always flush the black tank to ensure that nothing is left in it.
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Old 02-22-2018, 03:30 PM   #20
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Could be a vent through the roof blocked. Check to see if all roof vent caps are in place if one is missing that vent pipe could be blocked. Make sure none are obstructed with debris while up there. If possible and connected to sewer leave black valve open for an hour or so to see if drainage is slow. Another indicator of a blocked vent.
I rather thought that leaving the black valve open would guarantee a blockage. A poop volcano or human Bandini Mountain will result from leaving the black tank valve open. If you can, run a hose from the hot water heater in the house to your rv toilet. Fill it clear up til you can see the water at the base inside the toilet. Then dump again. If in the park, I guess you might be limited by what the hot water heater will produce, but in mine the shower hose will reach the toilet and with gas and electric on, mine will pump a whole lot of hot before it runs out.

keep flushing til it all works right or at least til it is all clean, because if you have to disassemble the black gate valve you will appreciate clean a bunch

And yes I know that from EXPERIENCE.
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