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Old 10-08-2016, 11:31 AM   #261
Join Date: Jun 2016
Location: Central Florida
Posts: 48
Originally Posted by tperk100 View Post
Even after lots of chemical in tanks, our bath smells like the tank is opened up to the room. Seems strongest odor is near toilet. Seal is good. It holds water for days. There is no obvious leaking or loose connections. No mold, mildew, stains anywhere including under sink.

I think problem is with toilet but have no idea of what it might be. Any thoughts?

This what we found!
(with ample black water chemicals)

Camping in Florida's 90 degree weather brings out odors. We noticed a strong odor in the bathroom after three days on our V-Lite with a front bathroom. Following my nose it was a weak odor in the bedroom and stronger in the bathroom. Opening the sink cabinet almost knocked me out. The odor was strongest on the left side where the sink drain runs through the wall in a hole 50% larger than the pipe.

Turning on the bathroom fan seemed to clear the odor in the bathroom but it got stronger in the bedroom. I suspected the sewer holding tank vent was cracked or the seal was defective. From the outside, I noticed the vent pipe runs up the bedroom wall and through the roof, RIGHT IN FRONT OF THE VENT FAN!

Back home, I took the bedroom wall down and found the hole through the roof and floor 50% larger than the pipe and no sealer. We drained the holding tanks before leaving the campground. At home, we over-filled the tank to make sure the vent pipe seal on the tank was OK. It was fine. Moving to the roof, I dug out the caulking on the vent pipe cap screw. Removing the screw and pulling the cap off exposed the source of the odor. The vent pipe was cut short and was below the roof cap top ring where it is supposed to seal around the pipe. So the STINK goes up the pipe and fills the roof cap and then down into the bedroom/bathroom wall and follows the drain pipe to the bathroom cabinet.

Whoever installed the roof cap knew the pipe was short and would not seal against the pipe. The cap was not even centered on the vent pipe. I checked the other two vent caps. The kitchen galley tank vent cap was OK but the shower waste water cap was the same as the sewer cap, short cut and off center. And why would anybody place a sewer vent right in front of a vent fan?

SOLUTIONS: The vent/drain holes through the roof, floor and walls were all sealed with spray foam. The gap around the roof cap and the vent pipe was filled with foam to overflowing and the vent hole inside the pipe was cut out with a knife. The cap was replaced and the screw caulked up.

For most owners with this problem, fixing the roof vent cap seal around the vent pipe will take care of it.

For Florida hot weather now using only
Thetford Aqua-Kem

2014 35 V-Lite 30WIKSS Platinum
Expedition 5.4, Hankook, Reese 1200 Round Bar, Trans-Go, Hadden, Curt Tri-Flex, 3.73 Posi-Traction
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Old 10-09-2016, 08:35 AM   #262
digger47's Avatar
Join Date: May 2012
Posts: 46
Hidden leak

The problem with this toilet is the seal inside the base. We went through the same issue and as soon as we lifted the base, we found the problem. We upgraded the toilet and have not had an issued since.

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