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Old 07-30-2018, 02:33 AM   #1
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Default Unexplained odor

My Rialta is almost 20 years old. There's nothing in the sewage tank, I've drained water out of tanks. There's this funky sewage odor that I can't get rid of. The stack on top is not stopped up. It comes and goes. Any suggestions on what I need to do. Excuse me if I don't use the correct terminology. All I ever had to do was pack and I don't know much about maintenance on my RV, my husband did that and he died. I'm not ready to stop traveling in it.
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Old 07-30-2018, 02:49 AM   #2
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This may seem like a dumb question... but is there any water in the toilet bowl? If not, it WILL stink up the place.

Or it could even be coming from the gray tank. They can get pretty funky smelling too.

I always used Happy Camper in both tanks to control the smell.
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Old 07-30-2018, 03:02 AM   #3
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Yes there's water in the toilet bowl. I drained all water from the gray tank and then put more in with some stuff I bought at Walmart to help with odor from the gray tank.
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Old 07-30-2018, 03:24 AM   #4
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Assuming you have water in all the sink traps, then you must have a plumbing leak somewhere. A properly-sealed system will have no odor at all. No need for chemicals.
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Old 07-30-2018, 03:46 AM   #5
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Part of that system usually includes an anti-siphon trap valve under the bath sink. It's like a PCV for the plumbing system and allows air in but not out. The spring/diaphram can become non functional over time. Had a relative that had this happen. He couldn't figure out the source of the odor and that was it. On his and my sink there is a vertical pvc pipe that is about 8" tall beneath the sink. It's topped with a black cap. The cap is the valve. Worth a look.
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Old 07-30-2018, 07:14 AM   #6
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If you have any rubber hoses in your waste system see if they are in good condition, time will take a toll on them. In the boating world it is normal maintenance to replace large rubber hose connecting a toilet to its waste tank every few years, these hoses will deteriorate in time. Take a wet rag - wipe a hose and test it for odor.
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Old 07-30-2018, 02:35 PM   #7
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.

Check the flange between the toilet and the floor.
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Old 07-30-2018, 02:43 PM   #8
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Post #5 is not what you have behind your toilet. See photo below. This was not my Rialta but you can see where the toilet leaked and stained the plywood. This could be the odor you are smelling. Also the shower drain trap may not have water in it (located in the floor shower pan.
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File Type: jpg Pluming System.jpg (30.0 KB, 23 views)
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Old 08-05-2018, 06:41 AM   #9
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I will second BBQ's comment. RVs can have a foam rubber gasket under the toilet that can crack when it gets old. It's easy to replace if you're handy, and not an expensive job if you're not.
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Old 08-05-2018, 04:09 PM   #10
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Sometimes the gray water holding tank can stink worse than the black.

Put a teaspoon of liquid holding tank treatment, like Thetford Aqua-Kem, down each of the sink drains and run a bit of water. (Shower drain too if you use your shower.)

Hopefully that will help.
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