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Old 06-03-2016, 02:03 PM   #1
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Sewer Smell in Bathroom

We just got this new trailer and our first day using it. We ordered the nice Maxair fans which we are very happy with.

So...taking a shower on the first night, turning on the fan. So nice...except suddenly a really bad sewer gas smell comes into the trailer. This smell cannot be coming from our new trailer since neither tank has anything in it except a small amount of clean water. We wondered who was dumping that smelled so bad? We went out and walked around the trailer to see if anyone had spilled sewer or was dumping. There was no smell outside. We came back in the trailer and the smell was really, really bad. In the bathroom and back bedroom.

I finally figured what the smell was coming from. When we have full-hookups, I always open the gray water tank to drain into the dump. While taking a shower, and with all of the windows closed, the Maxair fan creates enough vacuum to suck the sewer gas past the one-way air trap under the bathroom sink.

OK. That makes sense. So, now what???. I just closed the dump valve to the gray tank and.... problem solved....except now I have to crawl down and dump every other day.

Thinking.....thinking. Why don't the RV parks have P-traps on the sewer ???

Wait for it.....wait for it....

Make my own P-trap.......problem solved.

Now I can leave the gray dump open and run the fan without sucking in that awful gas.
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Old 06-03-2016, 02:15 PM   #2
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Thanks for this. We had the same issue this past weekend and I couldn't figure it out. Does the knink in the sewer line cause any issues... like backing solids up? I would think so, but not an expert for sure.
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Old 06-03-2016, 02:23 PM   #3
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It's being used for the grey water.....
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Old 06-03-2016, 02:26 PM   #4
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Don't forget you also have a sewer vent that exits the top of your trailer. When you flush and have your black water tank closed and fantastic fan on; it will do the same thing. I don't always run with the black water open but seeing the photo, I just might try that. So yeah, with the tank closed and fan running, when you flush, the fan will pull air back through the vent and up through the toilet. I just tell the kids to turn the fan off and then flush.
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Old 06-03-2016, 02:30 PM   #5
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Never leave the black tank valve open or you will end up with a brown mound. We never leave any tank valves open. We can go at least 5 days on all the tanks and sometimes a full week. Don't like venting a campground sewer system thru my trailer regardless of a having a slinky hose P trap outside.
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Old 06-03-2016, 02:33 PM   #6
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It's being used for the grey water.....
But it all goes down the same hose.
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Old 06-03-2016, 02:35 PM   #7
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Never leave the black tank valve open. We never leave any tank valves open. We can go at least 5 days on all the tanks and sometimes a full week. Don't like venting a campground sewer system thru my trailer regardless of a having a slinky hose P trap outside.
I think that's a better idea. I could just dump daily or something. I closed them on our last day to build up some to help with the flush.
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Old 06-03-2016, 03:02 PM   #8
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Don't forget you also have a sewer vent that exits the top of your trailer. When you flush and have your black water tank closed and fantastic fan on; it will do the same thing. I don't always run with the black water open but seeing the photo, I just might try that. So yeah, with the tank closed and fan running, when you flush, the fan will pull air back through the vent and up through the toilet. I just tell the kids to turn the fan off and then flush.
Never, leave the black open for any length of time, you could be in a world of hurt down the road.
Even dumping the black daily is not advisable, reason being you need that water/liquid to move solids and TP out of the tank, otherwise it can stick and solidify thus creating a wall or jamming your valve.

To each their own but I really don't see the purpose in leaving the grey(s)open.
If you use lots of water when flushing the black then the tanks will roughly, I say roughly fill at the same time, therefore dump them at the same time, black first, then grey(s).

Like I say to each their own and if the P trap works for you then great, after all your doing this for your not me.

John
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Old 06-03-2016, 03:06 PM   #9
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But it all goes down the same hose.

I think he meant that they use this for the gray water only. When it comes time to dump the black tank, they lift the hose, eliminating the trap.


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Old 06-03-2016, 03:07 PM   #10
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To each their own but I really don't see the purpose in leaving the grey(s)open.
John
The only time you should consider leaving your gray valve open is in you have a Washer installed and are doing laundry.

Other than that, like all the others have said "Keep 'em Closed!"
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