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Old 06-16-2018, 11:08 AM   #1
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Sewer odor smell when open sewer valves

I am getting a significant sewer odor smell, primarily in the kitchen for some reason, when I open the sewer valves. I am at a private full hookup camp sight and when I try to open the sewer valves to dump my holding tanks, I get this smell. I DO NOT get any odor unless I open the valves. When all the valves are closed I get no odor at all so obviously I am sucking odor from the sewer back into the camper. I would appreciate any advise.

John Lewi
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Old 06-16-2018, 11:08 AM   #2
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I meant campsite
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Old 06-16-2018, 12:12 PM   #3
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Is the anti-siphon valve in the kitchen? Perhaps it has gone bad.
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Old 06-16-2018, 12:17 PM   #4
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fill your sink drains with water before you dump

and

you may have a faulty/stuck air admittance valve behind/under the sink...



ours sometimes does the 'smell' after we've dumped and on our way to our next travel destination... we've found that it's because the vacuum created by the gravity dumping of the tanks can actually pull out your drain's p-trap water, which provides a way for the 'smell' to then be brought back into the coach when driving with a window or vent open.
We just fill each drain with a cup or so of water before we leave. Problem solved.
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Old 06-16-2018, 10:08 PM   #5
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If it is under the kitchen sink, your «automatic» vent is most probably the culprit.

The grey sewer tank odor is not very far away from the black one one the «stench» scale.
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Old 06-17-2018, 07:39 AM   #6
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If you have a newer RV you probably have water-less traps in the kitchen and bath sinks. It should be easy to tell by looking under the sinks. The hard one to know is the shower drain. Our 2017 MH has water-less traps on both sinks but a "P" trap on the shower drain.
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Old 06-17-2018, 07:42 AM   #7
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Do you have a ceiling vent fan on?
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Old 06-17-2018, 04:53 PM   #8
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Thanks for all your replies. I forgot to mention that I have 38 ft Cedar Creek Fifth Wheel. I do have p-traps under the sink. I do not know what or where the "vents" or automatic valves or anti siphon valves are under the sink. Will have to look. I will try putting some water in the kitchen sinks before I dump and see what happens.

Thanks, John
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Old 06-17-2018, 05:23 PM   #9
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Look for this.
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Old 06-17-2018, 05:37 PM   #10
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Quote:
Originally Posted by Flybob View Post
Look for this.
John Look for this under the kitchen sink. If I can help let me know I am just a few minutes from Cabot

Danny
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Old 06-17-2018, 05:58 PM   #11
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Thanks for all your replies, I will look for that under the sink.

John
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Old 06-18-2018, 01:35 PM   #12
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Originally Posted by AudiDudi View Post
Is the anti-siphon valve in the kitchen? Perhaps it has gone bad.
There should be an AAV beneath every sink.
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Old 06-18-2018, 02:01 PM   #13
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It could be sewer gas from the Campground's septic system backing up into the RV. Make sure you maintain a tight seal at your sewer connection and let your sewer hose droop down in one place to let the liquid make a seal like in a p-trap.
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Old 06-18-2018, 02:08 PM   #14
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Originally Posted by Cypressloser View Post
It could be sewer gas from the Campground's septic system backing up into the RV. Make sure you maintain a tight seal at your sewer connection and let your sewer hose droop down in one place to let the liquid make a seal like in a p-trap.
Yep... some campgrounds (we have been in two in 40 years) inherently have some pressure in the system and even with everything working correctly, it would burp back into the camper. (usually when someone else dumps)

Adding a droop to the sewer hose (like a P-trap) is a good suggestion but sometimes (contrary to Cypressloser's other suggestion) cocking the sewer connection at the the inground sewer port (so it doesn't seal well) often lets the built up pressure (and smell) escape BEFORE it backs into the R/V. That may be against code though. Be sure to check.
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