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Old 10-12-2017, 07:54 PM   #1
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Smell

Just went in my rv, after not using it for a week, it was left with the black tank half full, always drop a packet of blue stuff in the tank after we use it for the weekend. The Camper had a terrible sewer smell,what is causing this? 2004 coachmen freelander.
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Old 10-12-2017, 08:05 PM   #2
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Well, you should put a good liquid black tank treatment in beforehand at least A minimum of 4oz depending on the type you use. Just putting the blue stuff in is not sufficient. I personally would never leave anything in the black tank after a weekend of camping.
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Old 10-12-2017, 08:13 PM   #3
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The gray tank often smells far worse than the black and if you did not run water in the sinks after driving the water in the traps may have drained out when cornering. There are also air admittance valves that can go bad and let gray tank smells in. Also if your toilet does not hold water then it is not blocking the black tank smell.

Your tank smell should never be an issue if all the seals and vents are working properly. I never use any chemicals in my tanks and can go 2 weeks between dumping with no smell at all. The secret is just lots of water and keeping the seals and vents working.
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Old 10-12-2017, 08:16 PM   #4
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Sometimes the bolts tat hold the toilet bowl to the floor flange get loose and the tank smell will fill the cabin. I just went through that a couple of days ago. Also the rubber seal under bowl may become worn and cracked causing order leakage. requiring a replacement of the seal ring. Done that one too.
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Old 10-12-2017, 08:35 PM   #5
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Originally Posted by keymastr View Post
The gray tank often smells far worse than the black and if you did not run water in the sinks after driving the water in the traps may have drained out when cornering. There are also air admittance valves that can go bad and let gray tank smells in. Also if your toilet does not hold water then it is not blocking the black tank smell.

Your tank smell should never be an issue if all the seals and vents are working properly. I never use any chemicals in my tanks and can go 2 weeks between dumping with no smell at all. The secret is just lots of water and keeping the seals and vents working.


I agree and do the same.
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Old 10-13-2017, 08:04 AM   #6
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Thanks for the replies, it was no water in the traps, another lesson learned. Grey tank is empty but you are right that tank does smell bad.
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Old 10-13-2017, 09:23 AM   #7
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Pouring (1) cup of "rv antifreeze" down each sink/shower/tub so it fills the trap and any trap used by a washer/dryer if the rv will be sitting for more than (1) week will usually work as it doesn't evaporate. Your air admittance valves under each sink might be bad allowing grey tank odors to escape. The valves are available in the plumbing section at most big box stores at a reasonable cost and are removed by hand and the new one(s) installed hand tightened.


https://www.lowes.com/pd/Keeney-1-1-...e-Vent/1069119
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Old 10-13-2017, 10:53 PM   #8
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You can also use cooking oil in the traps since it won’t evaporate.
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Old 10-14-2017, 10:51 AM   #9
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You can also use cooking oil in the traps since it won’t evaporate.
don't think this is a good idea! oil will stick to the ptrap and the pipe walls...

op, do you have the smell in the storage compartments neighoring the wet bay as well?
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Old 10-14-2017, 11:36 AM   #10
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You can also use cooking oil in the traps since it won’t evaporate.
Not a good idea. All that will do is eventually get into the gray tank and cause more oily film on the inside of the tank, causing the water level sensors to be even more difficult to be accurate. Most everybody already has enough problems with their sensors.

We FT so our situation is a little different in that, our coach doesn't sit without being used. Every once in awhile—like when you lean over the sink when you are brushing your teeth—if I smell just a hint of foulness beginning to start, I make a light 10-1 mixture of bleach & warm water in a 1/2 Gal. pitcher, and go to each sink and shower and pour that solution down the drain and let it sit for a couple of hours before we use those areas again. I try to do it at night time before we go to bed so it sits there all night. It freshens everything right up. Even if it doesn't smell a little, I'll do this about once a month or so as a precautionary measure.
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Old 10-14-2017, 11:52 AM   #11
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The p-traps wont dry out in a week...even in Utah.
And the sinks arenít part of the black tank unless the bathroom sink is connected to it.

When our toilet was leaking we would get sewer smell. Replaced toilet. Not worth rebuilding but was an option.

The blue packets are worthless. I switched to happy camper cleaner and treatment and we get very little odor when flushing and none when sitting for weeks. We even have some function of 14 year old sensors.
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Old 10-14-2017, 12:15 PM   #12
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Also, donít put bleach in black tank. Mixed with the ammonia you will create your own brand of agent orange and kill yourself.
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