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Old 07-14-2016, 06:07 PM   #1
Supergrover
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Sewage smell in bathroom

Aside from the obvious... anyone have an odor they can't figure out where it's coming from?

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Old 07-14-2016, 06:24 PM   #2
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Is there water in your tub and sink traps, the grey tank can stink too.
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Old 07-15-2016, 02:47 AM   #3
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Look around for anything unusual. Are there mouse droppings anywhere? If a critter got in your coach and died, it may smell a bit.
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Old 07-15-2016, 03:04 AM   #4
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A few things to look at -

Is there a powered roof exhaust vent you leave on in the bathroom when you flush? That will suck the fumes out of the tank through the toilet. If it's set to pull air in, it may also suck in the black tank vent fumes.

Is the black tank vent close to the roof vent? That may allow fumes to drift in without a fan to help.

Is the tank vent cap jammed too tightly down on the vent line?

Does the shower or sink drain into the black tank? If so, you need a water trap somewhere in those drains.

Do you have a toilet drain pipe to tank leak?

A black tank leak?

A drain valve leak and drip to the belly cover?

A pet that left a 'present' behind the toilet?
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Old 07-15-2016, 06:59 AM   #5
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Some Dometic toilets have reports of leaks from the bowl into the pedestal were the waste collects.

http://www.keystonerv.org/forums/sho...ic+toilet+leak
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Old 07-15-2016, 07:02 AM   #6
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Make sure there is always water in the toilet bowl, this is your p trap. Sometimes there is a small leak and the water drains out over time which would allow the fumes to come up into the bathroom.
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Old 07-15-2016, 07:07 AM   #7
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There is a vent under your bathroom sink. It looks like a black PVC cap. It has a rubber seal that goes bad. Can replace it for like 10 to 20 dollars.
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Old 07-15-2016, 07:11 AM   #8
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The cap just threads on. Easy to replace
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Old 07-15-2016, 10:15 AM   #9
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Above answers where all good advice. But, I have a couple of questions that may help what you look at or repair. Is this odor always been present with your rv. We do not know if you have a used or new rv or how long you used it. Have you had rvs in the past and never had this type of odor.
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Old 07-23-2016, 12:59 PM   #10
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One night on our 30 day, 9000 mile trip we just took, we started to smell a strong sewer smell. We were Hooked to the sewer on our front and back tanks. I immediately closed all the grey valves to the sewer, the black was already closed. Still stunk.

Checked around and all 3 drain vent caps had vibrated off durring travel and needed to be screwed back in place. One under the kitchen sink, one under the bathroom sink and one in the rear pass through for the shower.

After putting all three back on, smell was gone even after re opening the grey tank valves.
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Old 07-23-2016, 05:44 PM   #11
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Intereting....but being new to TT, what are these vents caps?? If they fall off does stuff not leak everywhere ....or of they are off,,are they not venting??? I will need to go look at mine but want to understand these.


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Old 07-24-2016, 05:40 AM   #12
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They are basically a one way diaphragm valve that lets air in the drain line so the water flows to the tanks and not burble like when you pour a milk jug. There is one after the p-trap on all three of my sink/shower lines. It is a pvc cap looking thing that screws into the threaded pipe and they are higher up than the p-trap so as not to let water out even if they were missing. If you follow the drain from the sink, past the p-trap and before it goes down to the tank, it should be in line if you have them. They vent the lines without having to continue a vent pipe to the roof for each drain. Like in house construction, you need to let air into the drain system to make the water drain to the tanks efficiently.
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Old 07-24-2016, 05:44 AM   #13
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Oh yeah, if they are off they are venting. But since it is after the p-trap, if you are hooked to a sewer line and have the gate valve of the tank open so as not to fill your tank, you now have raw sewer gas coming up into your tank and out your missing vent cap into your trailer.
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Old 07-24-2016, 06:00 AM   #14
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Ittle Dew Too, Howdy;

Quote:
Originally Posted by Ittle Dew Too View Post
One night on our 30 day, 9000 mile trip we just took, we started to smell a strong sewer smell. We were Hooked to the sewer on our front and back tanks. I immediately closed all the grey valves to the sewer, the black was already closed. Still stunk.

Checked around and all 3 drain vent caps had vibrated off durring travel and needed to be screwed back in place. One under the kitchen sink, one under the bathroom sink and one in the rear pass through for the shower.

After putting all three back on, smell was gone even after re opening the grey tank valves.
You wouldn't happen to have a photo of one of those valves would ya?
I'm curious as to what they look like and where exactly they may be.
Thanks.

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Old 07-24-2016, 05:04 PM   #15
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My trailer just went to storage after a thorough cleaning after our trip, but I found the cap online.


https://www.rvupgradestore.com/Lasal...-p/10-1671.htm
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Old 07-24-2016, 07:15 PM   #16
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Quote:
Originally Posted by Ittle Dew Too View Post
My trailer just went to storage after a thorough cleaning after our trip, but I found the cap online.


https://www.rvupgradestore.com/Lasal...-p/10-1671.htm
I don't believe you purchased this, but rather just used the website to show a photo of the vent cap. Just to give you (and others) an example of how items with "RV" in their title are marked up, the price for the vent cap you listed is $12.80, a similar vent cap at Lowes is listed at $5.39... http://www.lowes.com/pd/Keeney-Mfg-C...e-Vent/1069119 The website you listed is a relatively inexpensive one, the same vent cap (by part number and manufacturer) is $23.27 at Amazon.com.....

Just another example of the "marine" and "RV" markup....
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Old 07-25-2016, 07:39 AM   #17
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Quote:
Originally Posted by JRTJH View Post
I don't believe you purchased this, but rather just used the website to show a photo of the vent cap. Just to give you (and others) an example of how items with "RV" in their title are marked up, the price for the vent cap you listed is $12.80, a similar vent cap at Lowes is listed at $5.39... http://www.lowes.com/pd/Keeney-Mfg-C...e-Vent/1069119 The website you listed is a relatively inexpensive one, the same vent cap (by part number and manufacturer) is $23.27 at Amazon.com.....

Just another example of the "marine" and "RV" markup....
And more expensive if an "aviation" item.
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Old 07-25-2016, 01:28 PM   #18
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X2

Quote:
Originally Posted by Trailsport07 View Post
There is a vent under your bathroom sink. It looks like a black PVC cap. It has a rubber seal that goes bad. Can replace it for like 10 to 20 dollars.
This valve went on our SRX last year, believe its the black tank rinse one-way valve, definitely check this area out.
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Old 07-29-2016, 02:43 PM   #19
Ittle Dew Too
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As I stated, my camper is in storage. No, I did not purchase it online as my camper already has three of them, I did however try my best to find a picture of what it looks like to aid in another's search to fix a problem.

I should have known to clearly state the fact that it was a photo and not a purchase so as not to confuse people.

I should have also known better than to try to help, as I knew others would question my post, the locations, the type and function of the caps, and any other thing that might not be exactly like their trailer, fifth wheel, toy hauler, hybrid tent camper, truck camper or anything else in vast sea of camper types and models that I failed to cover, to their level of satisfaction.

I do hope, however, the person who was looking for help found the picture helpful in determining if their vent caps were missing or in place.
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Old 08-01-2016, 03:15 PM   #20
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Ittle Dew Too: I thought your replies were very informative and straight forward. Thank You for them!
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