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Old 09-24-2016, 05:56 PM   #1
Join Date: Mar 2015
Posts: 56
Blank Tank vent and Attic Vents

Our TT is parked permanently for the foreseeable future. We stay the weekend in it every week or two and empty the tanks when we leave. Since the TT doesn't get moved, I know the black tank doesn't get stirred up like it should. When we return, the inside of the TT smells horrible. There is no way for the smell to come in thru the toilet, so where is it coming from? We are parked under an RV port with the peak of the roof about 6' above the TT. When I am on the roof, the smell can be very strong. Is it possible the smell is getting into the TT through the attic vents? Any thoughts are appreciated.

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Old 09-24-2016, 07:10 PM   #2
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Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 17,155
I'd check the 'cheater vents' under the sink cabinets. These are used to vent P traps that aren't connected to a rooftop vent. Also known as an Air Admittance Valve, they can fail and allow sewer gases into the under cabinet area. Easy to replace, they just unscrew and get replaced. Found at Home Depot, Lowes, etc.

Also make sure the toilet valve is closed and allow a little water to sit in the bowl to insure the valve is closed and not leaking.

Next time you dump the black tank, you might string a hose into the bathroom and run water down the toilet to help clean out the black tank. Also make sure all traps have water in them. The shower and if you have washing machine plumbed, make sure that trap has water in it.


Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 09-24-2016, 10:49 PM   #3
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Vintage RV Owners Club
Join Date: Jul 2015
Location: Oregon County, MO
Posts: 184
If the smell is that strong on the roof it's certainly possible. I would check all those other things first though. and I would second the recommendation of flushing out the black tank with water when you empty it.

Just empty the tank, close the valve, fill it to full with a hose and then empty again after you've let it sit full for a while. This will probably also make the tank gauge read empty like it's supposed to as an added bonus. The tank should always be full when emptied so it flushes out properly so you can also fill with water the rest of the way if it's not full by the time you need to empty it.

Also an extra added tip: never leave the sewer hose attached 24/7 it's a great way for vermin to climb in.

I've been living out of my motorhome in one location for over a year now and that's how I manage it. I also run some bleach and hot water down the sink until the grey is about 2/3rds full when I do a dump so I have some nice hot soapy water to rinse out the sewer hose with when I'm done with the blackwater tank.
1991 Rockwood A1270
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tank, vent

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