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Old 07-01-2016, 10:04 AM   #15
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My radiator pipe solution is working like a champ, however now when I flush the toilet, I am getting smelly air backwash, as if the vent is stopped up.

Any ideas?
It would be nice to see a piping schematic. Nothing serious but enough to see how the sink, black tank, and vent plumbing is laid out.

Since the smell is showing after the repair of the pipe connection, it now sounds like a slight pressure is building in your tank. Venting is crucial so as was stated above, a first step would be to examine the vent piping and make sure it is not obstructed.
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Old 07-02-2016, 09:02 PM   #16
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I took off the roof vent and there was a wasp nest in it, almost blocking it completely. Pulled that out and then took a 6' piece of 1/2" metal conduit, with rope attached, and dropped it into the vent pipe and it went all the way down to the el. It's much better now, but still a noticeable odor after flushing.

Plumbing diagram is attached.
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Old 07-02-2016, 09:13 PM   #17
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I did a quick search for a 1999 Santara, and the first one that I found had carpeting under the toilet. A small leak at the toilet base can cause odors, and the carpet hides the leak.


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Old 07-02-2016, 10:49 PM   #18
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This one may have had carpet originally, but it has vinyl now. Thanks for the post though.
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Old 07-03-2016, 12:06 AM   #19
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Your drawing looks pretty straight forward and should work fine. If there's no obstruction in the vent, is it possible there is a low spot in the line between the sink and the tank? I'm thinking if so, then it could be acting like a P trap, holding water, thereby causing a slight pressure in the tank.
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Old 07-03-2016, 12:36 AM   #20
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Some of that nest my have fallen down and is still blocking it a little.


I would do the hot water treatment as suggested earlier.

Be sure to have someone watching the sink for you as you pour the water,
don't want to accidently over flow it If there is a blockage at the tank.

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Old 07-03-2016, 01:07 PM   #21
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I'd run a plumber's snake all the way to the tank.
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Old 07-05-2016, 10:42 AM   #22
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Problem solved. I ran water down the sink since I had already resealed the roof vent (sink T is above where i was able to drop the conduit to) and maybe that flushed something out of the line. I'll post back if the issue returns.

I am thinking about buying a couple of solar powered roof vents to ensure there is always negative pressure in the tank. Any thoughts on these?
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Old 07-06-2016, 08:43 AM   #23
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Spoke too soon. Problem still exists, but just not as noticeable. I'll either make some solar vents or buy them, and see it that gets rid of the problem.
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Old 07-07-2016, 09:20 AM   #24
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Spoke too soon. Problem still exists, but just not as noticeable. I'll either make some solar vents or buy them, and see it that gets rid of the problem.
Your drawing above shows a trap in the sink drain.
It should contain enough water to block the smell.

Is it installed correctly?
Or do you have the duckbill kind of trap (might be called AAV).

I assume if you put one of those soft rubber sink stoppers over the sink drain, the smell goes away.

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Old 07-07-2016, 05:41 PM   #25
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Your drawing above shows a trap in the sink drain.
It should contain enough water to block the smell.

Is it installed correctly?
Or do you have the duckbill kind of trap (might be called AAV).

I assume if you put one of those soft rubber sink stoppers over the sink drain, the smell goes away.

Dan
I think VaDreamer stated that the smell came from the toilet when flushed. Still sounds like there is a slight pressure build up in the tank. The vent doesn't seem to be doing its job.
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Old 07-23-2016, 07:49 PM   #26
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Everything is installed correctly, as far as I can tell. I think you are right, Mudfrog, vent not doing it's job. Hopefully solar vents will help.
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