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Old 04-21-2014, 08:54 PM   #1
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Where is that smell coming from?

As were were packing up to leave after a 4 day outing, I opened up the cabinet doors under the island sink, and it smelled like sewer.....not really strong....but sewer smell none the less...we didn't smell it at all until I opened the cabinet doors. I did not see any leaks under the belly at the tanks. I'm wondering if the vent pipe is connected properly?
Does anyone know the holding tank layout for 2014 36ckts and how/where the vent pipes are interconnected?

Thx
Reck
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Old 04-21-2014, 09:09 PM   #2
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I'm not familiar with you're particular rig , but... An island sink, in home or camper, usually has a "pop off " vent. A vent above the trap. Looks like a cap on a 11/2 or. 11/4 vertical pipe. In this case it could one of two things , or maybe a combo. If the camper has been sitting a long time , the trap may not have any water in it, which will let gasses from you're grey tank enter the cabinet. If this is the case, just run some water in the sink, this will fill the trap,and block the gasses. Also the grey tank will get some bacteria,build up,over time. There are multiple remedy's for this, bleach,or a similar approach.
May be way off,but it's worth a try !!
Happy camping !!
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Old 04-21-2014, 09:13 PM   #3
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What Buck said---can you give us more info on how long the unit was in storage before the trip and how it was prepped?
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Old 04-21-2014, 09:31 PM   #4
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Sometimes when the grey tank is full and you pull the handle to dump it, the outgoing flow will overcome the vent capacity and suck the p trap dry.
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Old 04-21-2014, 09:50 PM   #5
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It was winterized from Nov- March with antifreeze. When winterizing, I let the faucets run to fill the p trap with antifreeze. The smell is not coming from the sink drain, but from under the cabinet through the hole in the floor where the pipes come through, and it smells like the black tank.
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Old 04-21-2014, 10:18 PM   #6
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We have a 2013 40CFK. The kitchen sink is against the tow-hitch wall. The sink has it's own holding tank. Because it's against the forward wall, there's no path for a roof mounted vent pipe. FR ran a PVC pipe inside the sink counters to the side of the rig and terminated it with a flush fitting on the outside.

We would frequently get horrible odors inside the rig. The dealer removed the horizontal vent pipe and capped the the vent pipe under the sink with an Air Admittance Valve. This cured the problem.

In your situation, FR may have run a horizontal pipe below the floor instead of installing an AAV. Since FR doesn't supply or offer on-line electrical and plumbing diagrams, you're on your own to trace it out.

Cheap AAV have diaphragms that stick or dry and crack. Most can be unscrewed and replaced, but, some have to be totally replaced.

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Old 04-21-2014, 10:44 PM   #7
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When I dump my black water I try to make sure I close the other gray water valves the previous day or two. I have heard that if the other valves are open the black water can get in the gray water tanks. Don't know if it is true. I like to have the other tanks to flush the hose out after dumping the black water. Don't know if it will help but I have good results this way. In the hotter times I will put pine sol in the kitchen sink if I think I needs it. Hope it helps that is not a fun time. Also well water campgrounds have done that to me as well.
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Old 04-22-2014, 05:45 AM   #8
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Same thing happened on our 2014 34RLSA. Was the Air Admittance Valve.

Look under the sink (on mine the Air Admittance Valve is in the upper left corner) unscrew it. Get a new one and it will probably solve your problem. Did for me.
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Old 04-22-2014, 12:39 PM   #9
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Yes, I never have the grey tank valves open when dumping the black tank. Always use the the gray to clean the slinky after the black valve is closed.

I will check the air admittance valve as recommended, and let ya'll know.
Thank you for the tips !
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Old 04-22-2014, 12:48 PM   #10
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Your grey tank can give off a smell just as bad as your black tank. The possibility also exists that the inlet into the tank was not sealed properly or completely from the factory, allowing the smell to rise up through the floor.
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