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Old 02-26-2015, 02:29 PM   #1
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Angry Black Tank Vent Problem

Burping toilet on a 321rlts fifth wheel which also routinely plugs at the tank inlet. Assume the roof event piping has broken/separated and fallen into the tank. The vent pipe is adjacent to the elbow inlet to the tank. Thought about a TV camera w/scope or cutting a hole in the wall column just behind the toilet. Has anyone had a structure failure with the tank or vent attachment? Any suggestions/recommendations are greatly appreciated.
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Old 02-26-2015, 03:32 PM   #2
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You could slide a wide tape measure down the vent pipe to see if it is below the water level. Also check to see if there are signs that the vent pipe has slipped down far enough to be below the water level which would cause the burp.
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Old 02-26-2015, 03:36 PM   #3
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Not sure if I understand your problem but you may have had something go into your vent pipe from the roof. Try running water down the vent pipe from the roof and see if that changes anything.
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Old 02-26-2015, 03:51 PM   #4
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Thanks, I did run a garden hose down the vent and water from that hose does drain.
Just don't know if I'm at the tank bottom. I assume the tank is pitch and when the liquid level rises to where I believe the vent is it starts burping. I also ran the hose down the toilet inlet and hit a hard restriction. Any other thoughts are appreciated.
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Old 02-26-2015, 04:08 PM   #5
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Unless your setup is different the toilet is a pretty simple task to remove. Almost like your home. Lift it out and see what you have. It may be a toilet issue. Wish I could help more we have never owned a fifth wheel only TT and class A.
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Old 02-26-2015, 04:08 PM   #6
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had same problem on brothers we fought with vent for days it ending up being solild build up at inlet
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Old 02-26-2015, 04:19 PM   #7
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If the toilet is close to your storage compartment you can take part of the wall loose and see in or reach the pipe . The storage walls are usually easy to take off with a small square head screwdriver.
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Old 02-26-2015, 04:57 PM   #8
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Quote:
Originally Posted by finney View Post
had same problem on brothers we fought with vent for days it ending up being solild build up at inlet
This gets my vote. Your symptoms sound familiar and this is usually the case that comes from not using enough water when flushing. IMHO
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Old 02-26-2015, 05:09 PM   #9
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our old camper had a turn right under the toilet that would clog periodically and I ran a snake through it ... I would check toilet side next with water turned off and hold valve open and try to get a passthru into tank
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Old 02-27-2015, 04:58 AM   #10
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My sister wasn't using as much water per flush as I had told her to use and over time I got a plug right where the pipe from the toilet enters the black tank. I couldn't see it, but it was definitely plugged.

Get one of these:

Search - black tank wand - Camping World

Solved the problem in seconds.
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