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Old 01-20-2015, 10:54 AM   #1
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Black tank vent plugged?

Not sure if anyone else has experienced this, but just back from a beach trip without sewer line hookups.
When we used the toilet, the "water" would bubble back up once it filled after flushing. There was back pressure that actually pushed enough air up the drain, to allow that water to spray back out of the toilet. Not good.
I checked the black tank valve to ensure it was sealing by removing the drain cap and inspecting for leaks.
I can't imagine the vent plugging but pressurizing the tank isn't a good thing.
Any thoughts or ideas?
Thx.
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Old 01-20-2015, 11:53 AM   #2
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Have you tried sticking a garden hose in the vent pipe and trying to flush it back down into the tank?
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Old 01-21-2015, 09:11 AM   #3
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Not yet, but my original thought was to take my 25' 3/8" snake and run it down the vent.
I like the garden hose idea better.
I really wondered if others have faced this same issue before?
It's a lot more back pressure that I wouldn't expect, even with a blocked vent.
I will update next week when I get over to the trailer.
Thx.
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Old 01-21-2015, 10:16 AM   #4
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This topic has got me very curious. I cant imagine how any back pressure could build up in the black tank. every time you flush you open a large hole which would relieve any pressure in the tank, thats if the vent wasnt working at all. I will watch this thread with anticipation of the problem and solution. The only time I have ever heard of the black tank being overpressurized is with the San-T-Flush system and the drain valved closed allowing the black tank to be overfilled during cleaning
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Old 01-21-2015, 10:33 AM   #5
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I agree with Jason. That's a big tank to pressurize with just a flush. My initial thoughts are that the 3" drain pipe is either too close to the bottom on the tank or you have mounded a pile at the bottom of the tank/drain pipe. The air you see coming up is from the 3" pipe going TO the black tank and is being forced up (no other place to go due to the blockage) by the water from the bowl going down the drain. Hope this description makes sense to you.
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Old 01-21-2015, 11:46 AM   #6
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You could use a drain snake if you have one. I would use a hose first if you don't. Probably needs a good flushing. The pressure thing is confusing though.
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Old 01-21-2015, 12:41 PM   #7
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Sounds like the tank is full or liquid level is higher than the pipe going from the toilet.
I would drain and pour water down toilet and see if it still bubbles
But its just my $00.2
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Old 01-21-2015, 01:46 PM   #8
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Quote:
Originally Posted by cw3jason View Post
This topic has got me very curious. I cant imagine how any back pressure could build up in the black tank. every time you flush you open a large hole which would relieve any pressure in the tank, thats if the vent wasnt working at all. I will watch this thread with anticipation of the problem and solution. The only time I have ever heard of the black tank being overpressurized is with the San-T-Flush system and the drain valved closed allowing the black tank to be overfilled during cleaning
Quote:
Originally Posted by Stan View Post
I agree with Jason. That's a big tank to pressurize with just a flush. My initial thoughts are that the 3" drain pipe is either too close to the bottom on the tank or you have mounded a pile at the bottom of the tank/drain pipe. The air you see coming up is from the 3" pipe going TO the black tank and is being forced up (no other place to go due to the blockage) by the water from the bowl going down the drain. Hope this description makes sense to you.

Don't you think it possible if the vent pipe is plugged---when you flush the toilet and drop that mass down into the holding tank, the air has to go some place and if the vent is plugged, the only way it has to escape is back up the toilet?

I will monitor this tread for the results and findings.
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Old 01-21-2015, 01:57 PM   #9
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Quote:
Originally Posted by Lloyd View Post
Don't you think it possible if the vent pipe is plugged---when you flush the toilet and drop that mass down into the holding tank, the air has to go some place and if the vent is plugged, the only way it has to escape is back up the toilet?

I will monitor this tread for the results and findings.
If the mass is large enough to cause pressure when flushed, one might consider more leafy vegtables in ones diet

but seriously, I have never heard of this. Was the toilet overful maybe? He did say he was not hooked up to sewer, maybe just to much contents
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Old 01-21-2015, 02:05 PM   #10
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Could the windy conditions going down the vent pipe have caused you're problem?
I'm also thinking if the vent was clogged then the smell would be really bad.
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