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07-19-2016, 03:18 AM
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#1
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Seasoned Camper
Join Date: Sep 2007
Location: mgtn
Posts: 54
M.O.C. #7711
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Black tank odor
Needing help. When we flush toilet the odor comes into rv. I'm assuming the vent is clogged. When I go on top of rv, I tried the sniff test over vents. No smell. Which of the 3 vents is black tank and can I stick a hose down to clear. Thanks for any help. The wife would appreciate it even more...
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07-19-2016, 04:00 AM
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#2
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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If you have the exhaust fan in the bathroom running when you flush it could be drawing the odor back into the room.
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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07-19-2016, 06:00 AM
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#3
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Montana Master
Join Date: Sep 2014
Location: Full Timer In Naples, Florida
Posts: 1,049
M.O.C. #15731
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Quote:
quote:Originally posted by WeBeFulltime
If you have the exhaust fan in the bathroom running when you flush it could be drawing the odor back into the room.
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I will agree. Fill the bowl when flushing first then dump the toilet so the valve is only opened as little as possible. My fan is a high powered fan and will pull gas in from the tank if left open too long. 
__________________
2017, 3500 Ram Big Horn, 4x4, Crew Cab, DRW, Aisin Transmission, 4:10. Curt Q20, 2014 Mountaineer 331 RLT, Sailun's on the rv and truck.
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07-19-2016, 06:38 AM
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#4
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Montana Master
Join Date: Jul 2010
Location: Lake Havasu City AZ.
Posts: 1,811
M.O.C. #10552
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Yep the fan will do it. Turn off the fan flush the toilet turn the fan back on.
__________________
Wayne and Ann Moore
2015 Ford F-350 King Ranch
Firestone air bags, bed saver.
Add 40 GAL tank in bed.
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07-19-2016, 08:52 AM
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#5
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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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I posted on this exact topic a few weeks ago. After 11 years it was the first time I had the issue when I brought the 5'er out of 5 month winter storage. Not smelling sewer at the vent pipe indicates to me there is a blockage. Went on the roof and stuck a hose down the black tank vent. It was the one closest to the toilet room. Never felt an obstruction when lowering the hose in the vent but once I flushed it with a generous flow of water my problem went away. I was pleased the fix prove to be so easy. Jim
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2006 3000RK
2009 Ram 2500
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07-19-2016, 09:38 AM
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#6
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Montana Master
Join Date: Jun 2010
Location: Colorado Springs
Posts: 3,335
M.O.C. #10496
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Good work and thanks for passing along your solution!
Quote:
quote:Originally posted by jimcol
I posted on this exact topic a few weeks ago. After 11 years it was the first time I had the issue when I brought the 5'er out of 5 month winter storage. Not smelling sewer at the vent pipe indicates to me there is a blockage. Went on the roof and stuck a hose down the black tank vent. It was the one closest to the toilet room. Never felt an obstruction when lowering the hose in the vent but once I flushed it with a generous flow of water my problem went away. I was pleased the fix prove to be so easy. Jim
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__________________
2010 3150RL
LevelUp, Dual 6 volt batteries, Progressive Industries EMS HW50C, Honda EU2000i Generator, Bridgestone Duravis R250 tires, Torklift Glowstep Revolution Stairs, LED Tail lights
2015 RAM 3500 Laramie SRW LB CC Cummins 6.7L Aisin Trans B&W RVK3600
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07-21-2016, 03:39 AM
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#7
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Seasoned Camper
Join Date: Sep 2007
Location: mgtn
Posts: 54
M.O.C. #7711
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Thanks everyone for replies. So far we've been trying the fill the bowl and turn fan off idea. And it has been working. Still curious why I couldn't smell anything from vent pipe. Guess the ole sniffer ain't what it use to be...
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07-21-2016, 04:17 AM
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#8
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Montana Fan
Join Date: Aug 2012
Location: Fowler
Posts: 414
M.O.C. #12748
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If you are still trying to determine which stack is the sewer, have someone flush the toilet while you are conducting your sniffing exercise. This will create some turbulence and you have a good chance of smelling and hearing which one it is. Good luck.
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07-21-2016, 10:00 AM
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#9
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Established Member
Join Date: May 2016
Location: Springville
Posts: 30
M.O.C. #18656
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rmthelen
Quote:
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quote:have someone flush the toilet while you are conducting your sniffing exercise. This will create some turbulence and you have a good chance of smelling and hearing which one it is.
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Do not think of Robin Williams when you do this.
__________________
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2006 Mountaineer 329RLT
2011 Ford F-250 Lariat 6.7
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07-21-2016, 10:40 AM
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#10
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Montana Master
Join Date: Apr 2007
Location: South Shore
Posts: 6,009
M.O.C. #7110
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I checked my vents on the black tank by running water from the top of the vent through the the black tank. With the black tank drain open you should see clear water running out of the drain. You do need to have a clear section of pipe to see water coming out.
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2011 GMC 4X4 dually CC, 6.6 Duramax with Allison Transmission. Formally 2001 Montana,2007 3400RL Montana, presently 2018 3401RS Alpine.
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