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03-06-2022, 10:44 AM
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#1
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Seasoned Camper
Join Date: Jan 2021
Location: Cumming
Posts: 84
M.O.C. #27901
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Black tank odor
We have a 2021 Montana High Country 331RL and we are getting an odor from our black tank inside. I have been dumping and flushing about twice a week. Does anyone have any ideas as to what could be causing this?
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2020 Ram 3500 CC, SWB, 4WD with Curt Q20 hitch 2021 High Country 331RL
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03-06-2022, 11:06 AM
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#2
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Montana Master
Join Date: Jun 2017
Location: Northern Illinois
Posts: 525
M.O.C. #19994
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first thing to check is your vent pipe, it might be blocked
make sure all your dump valves are closed, the sewer gas can penetrate through the grey and galley lines if open
is it all the time? I know from past experience, it the air pressure and wind are just right, it can tend to keep the fumes from exiting the RV
what type of digester are you using? I swear by Thetford dry
twice a week dumping may be too much, you need to let the digester work, use lots of water
good luck, keep us posted
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The "Black Pearl"-2017 3731FL Legacy Package
2017 F-450 Platinum, 6.7 PSD
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03-06-2022, 11:18 AM
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#3
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Seasoned Camper
Join Date: Jan 2021
Location: Cumming
Posts: 84
M.O.C. #27901
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Quote:
Originally Posted by team bradfield
first thing to check is your vent pipe, it might be blocked
make sure all your dump valves are closed, the sewer gas can penetrate through the grey and galley lines if open
is it all the time? I know from past experience, it the air pressure and wind are just right, it can tend to keep the fumes from exiting the RV
what type of digester are you using? I swear by Thetford dry
twice a week dumping may be too much, you need to let the digester work, use lots of water
good luck, keep us posted
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We are in Florida on full hookups and I do have the grey water lines open. We do use a lot of water in our black tank. It also has been very windy here. Thanks for the help! I’m going to close all valves.
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2020 Ram 3500 CC, SWB, 4WD with Curt Q20 hitch 2021 High Country 331RL
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03-06-2022, 12:32 PM
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#4
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Montana Master
Join Date: Dec 2007
Location: Kansas City, Missouri
Posts: 2,707
M.O.C. #7992
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An alternative to closing all valves, just put a drip loop in your sewer line. Works like a p-trap does under your sinks. I've used rocks or boards to create such a trap. About a foot from where my sewer hose hits the ground coming off the 5'er discharge pipe, I place a rock or board about 4" high. Whenever wastewater is discharged from the RV the loop created will stay full of water preventing sewer gases from coming back up the pipe into the holding tanks. Many of these RV Parks create quite an odor if too many people decide to dump tanks at the same time.
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2006 3000RK
2009 Ram 2500
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03-07-2022, 07:27 AM
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#5
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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My buddy had a similar problem. Turns out it was a cracked toilet low on the base.
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2016 3160, Legacy, Sailuns, Splendide 2100 xc vented, 1 1/2" axle lift blocks, disk brakes. 2014 Ram 3500 SRW SWB 4X4 6.7 Aisin Mega Cab, EBC slotted disks and brakes, Titan fuel tank.
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03-16-2022, 01:35 PM
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#6
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Montana Master
Join Date: Jun 2020
Location: Qualicum Beach
Posts: 665
M.O.C. #26399
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Quote:
Originally Posted by Chief Brown
We are in Florida on full hookups and I do have the grey water lines open. We do use a lot of water in our black tank. It also has been very windy here. Thanks for the help! I’m going to close all valves.
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Put a vertical kink in the open grey lines. It replaces the J or S trap in a house. This will block any gas coming up from the park holding tanks. Keep black closed unless dumping, but greys are optional, some close some open but the kink in the sewer line is mandatory to keep smells out. Also take a hose to the roof and run water down the vent with the valves open so you can see if it flows thru.
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2018 Keystone Montana 3811MS
2017 Ford F450 diesel dually
600AH Battle Born Lithium Batteries, 1,080 watts solar
3,000 watt hybrid inverter with 120A charger
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03-16-2022, 02:02 PM
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#7
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Established Member
Join Date: Jul 2020
Location: Knoxville
Posts: 13
M.O.C. #26665
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Yes Check the toilet
Quote:
Originally Posted by Montana Man
My buddy had a similar problem. Turns out it was a cracked toilet low on the base.
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Check the toilet, ours had a recall because of a factory defect.
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03-16-2022, 02:45 PM
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#8
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Montana Master
Join Date: Oct 2018
Location: Anderson
Posts: 2,587
M.O.C. #22835
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How close to the ceiling air vent, fan and the vent for the black tank from each other on the roof? I have heard stories in the past where black tank odor was inside the camper. It turned out when the wind blew the right direction, it would blow the black tank oders from the black tank vent on the roof directly into the ceiling fan on the roof and into the bathroom, causing .... bad smells inside.
Check it out. It might be just that simple. (or maybe not!)
Also,
If the bathroom ceiling exhaust vent fan is running and you push the pedal of the toilet, the slide valve in the toilet opens. The ceiling vent fan will pull air upward through the toilet. That air is sucked INTO the black tank from that same black tank vent, up the toilet and into the bathroom with a lingering aroma of yesterdays steak dinner!
Make sure when you "flush" the ceiling fan in the bathroom is off. Same if you have a ceiling fan, exhaust, vent in the kitchen. Turn it off when you flush. See if that makes a difference.
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Who you are right now is a sum total off all you use to be.
2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually
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05-13-2022, 04:25 PM
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#9
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Montana Master
Join Date: Mar 2015
Location: Gardnerville
Posts: 1,252
M.O.C. #17163
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Ours had odor. Come to find out the black tank was coming apart.
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