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Old 09-21-2014, 10:55 PM   #1
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Another bad smell question - where it comes from?

folks, this puzzles me please share your thoughts...

it started 20 days ago in canada - one day dw and i noticed a bad smell during driving. before that, it had never been having the problem. in that few days in canada, it was rainy, temperature was about 40-50 degrees f.

also noticed, when rig was parked, the smell was very light. when moving, the smell filled up inside quickly and heavily.

at the time, because the toilet bowl seals were not able to hold water overnight, first i was thinking something related to that. so i dumped the tanks, cleaned the black tank very well (fill/dump cycled 4 times) and stopped using it. well, the smell was gone.

after coming back to us, i replaced the toilet bowl seals, the toilet holds water tightly, no leaking. we started to use the toilet again. bomber, the smell came back!!

sniffed, the smell appears to be coming from restroom under sink cabinet, but its bottom board is dry and clean. however, there are gaps between the bottom board and the walls, could the smell gets up from under?

so where could the smell be from? could the black tank have cracks on top? (currently the black tank is not leaking liquid to ground). why it smells worse when rig was moving?

appreciate all thoughts/inputs.
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Old 09-21-2014, 11:05 PM   #2
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Hey!!!! Dont blame this one on Canada !

Sounds like it could be the screw on cap thats supposed to only alow air in, not out. Someone will be along that remembers there name !

May be called an air emittance valve.
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Old 09-21-2014, 11:23 PM   #3
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lol, no finger pointing canada actually we enjoyed the scene in thunder bay very much; gorgeous!!

the cap - that's promising - where is the cap? is it easy to access? thanks for your quick response

update: just googled "air admittance valve" and found it. i will take it out and inspect. hopefully this resolves the problem. big thanks!!!!!!
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Old 09-21-2014, 11:30 PM   #4
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Yeah, there usually just under the counter top. Looks like a 1 1/2" cap. Unscrew it, and inside will be a flapper valve and spring.
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Old 09-21-2014, 11:37 PM   #5
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Under each sink you will find an up right piece of black Plastic pipe with a valve on the end that screws onto this pipe. Reach up and unscrew the valve. It is only hand tight. When you look at the valve, you will see a rubber flap inside that allows air into the system but is designed to block air from your Grey Tank from coming into the coach. Your description, bad smell coming from under the sink, is indicative of one of the valves failing to seal particularly when traveling down the road when there could be a positive pressure build up in the holding tanks.
Normally, unless the toilet bowl seal is not working or you leave the vent fan running when you flush the toilet, the black tank is not a problem. A broken connection could also cause smell from the black tank but unusual.
The Grey tank however will back up smell into the coach via these check valves under the sink. Quite common.
I have taken mine out and cleaned the rubber flap under running water and reinstalled them successfully. The other alternative is to head to your Home Depot or other hardware store and buy new ones to replace them.
In addition, you should check the vent caps on the roof to ensure they are not damaged or broken. These can and do result in positive pressure in the tanks.
There are new products on the market such as "Cyclone" vent caps that actually keep a negative pressure on the tanks. You may want to look into these but first you should understand the causehttp://www.hepvo.com/ of the problem and decide how best to fix it given your particular situation.
Below are some sites that may help explain further and offer some solutions.

Hepvo Waterless Valve

http://www.amazon.com/s/ref=nb_sb_ss...nt%2Caps%2C412

http://m.youtube.com/results?q=holdi...%20vents&sm=12
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Old 09-21-2014, 11:46 PM   #6
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In addition to the above, I have used this product as directed and find it works very well at a reasonable price.

http://www.amazon.com/Happy-Campers-...=happy+campers
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Old 09-21-2014, 11:53 PM   #7
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I had a 1999 Monaco Dip. that had a smell, turned out to be the trap for the washer/dryer, we didn't use it much and it would dry up I guess,,, so I would pour some water into the drain hose every now and then, never smelled again.
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Old 09-21-2014, 11:58 PM   #8
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Quote:
Originally Posted by CJScepter View Post
I had a 1999 Monaco Dip. that had a smell, turned out to be the trap for the washer/dryer, we didn't use it much and it would dry up I guess,,, so I would pour some water into the drain hose every now and then, never smelled again.
John G.
Good point, I forgot about that one. On mine, I got some Plumbers Putty and worked in in around the drain hose at the top of the stand pipe to seal it off.
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Old 09-22-2014, 12:07 AM   #9
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thank you both wideglide and dennis so much!! i am learning new things that i had never known...

i took the cap out, the flipper appears to be in soft and good shape. cleaned with vinegar and water, i put it back in. will see if it works. if not, i will go home depot to get a new one. phew!!

dennis, cyclone appears an ultimate solution for tank odors. i also read good comments about happy campers. yesterday when i was in camping world to pick up the toilet bowl seals i particularly asked for this product, cw told me they don't carry it!! looks like i will order it from amazon when i get home.

happy rving!!
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Old 09-22-2014, 12:40 AM   #10
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I can vouch for both. Keep us posted.
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Old 09-22-2014, 07:14 AM   #11
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I too have been having the same problem on my new coach.
It appears to be from the grey tank and possibly the shower. Does it likewise have a valve?
My odors are coming from the closet area in the bedroom which is above the sewage compartment.
However, when taking a shower, one can smell it more than ever.
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Old 09-22-2014, 11:18 AM   #12
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Quote:
Originally Posted by EricGT View Post
I too have been having the same problem on my new coach.
It appears to be from the grey tank and possibly the shower. Does it likewise have a valve?
My odors are coming from the closet area in the bedroom which is above the sewage compartment.
However, when taking a shower, one can smell it more than ever.

If you have a Washer/Dryer, you might check the standpipe vent behind the washer. These are known to smell if the washer is not used a lot. I used plumbers putty and stuffed it around the drain hose at the top of the pipe. That did the trick.


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Old 09-22-2014, 11:54 AM   #13
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Quote:
Originally Posted by dennis45 View Post
If you have a Washer/Dryer, you might check the standpipe vent behind the washer. These are known to smell if the washer is not used a lot. I used plumbers putty and stuffed it around the drain hose at the top of the pipe. That did the trick.


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Nope. No washer/dryer in an ACE.
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Old 09-22-2014, 10:10 PM   #14
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smell

Quote:
Originally Posted by EricGT View Post
I too have been having the same problem on my new coach.
It appears to be from the grey tank and possibly the shower. Does it likewise have a valve?
My odors are coming from the closet area in the bedroom which is above the sewage compartment.
However, when taking a shower, one can smell it more than ever.
We had the same issue, smell in the bedroom. Found the air vent valve behind the drawers for the tub.
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