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Old 10-20-2021, 08:20 AM   #1
jackparretta
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leaking black tank

I have a 2018 333mks . I had it since new and never filled the black tank up because we just do weekend trips only then we add water then dump. This week we filled black tank up to full level to where you can see water coming up in toilet ( we used water hose down the toilet ) we notice water coming out over the bottom of the 5th wheel it stop when it to 3/4 to the full level , then i did it again and sme thing happened. I removed bottom cover to check were its coming from fill it up and its leaking from top of tank and running down the side of tank has anybody had this problem , just wondering when they drill vent or toilet pipe off center or something . it not a slow drip it pours out just as fast as i fill it .
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Old 10-20-2021, 08:41 AM   #2
JRTJH
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You may have a "unglued" vent stack. Some are glued in place, some are pressure fit. A pressure fitted vent stack can leak under pressure. If it's not the vent stack leaking, you likely have a split/rupture along the top of your black tank. They are "roto-cast" so there's no "seams on the tank" as they are all "one piece construction".

There are some "repair products for RV holding tanks" but successful repairs run about 50/50 from what I conclude from people who have tried to repair their tank.

For me, if I'm going to all the trouble of removing the underbelly material, removing the black tank to "get to the repair area", I'm going to just replace the tank with a new one rather than "risk" having to do it all over again if the repair job doesn't work and hold properly..... YMMV

ADDED: You didn't mention any "gawful" smells coming from the underbelly, so are you sure it's the black tank leaking ???
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Old 10-20-2021, 10:45 AM   #3
Ken / Claudia
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I am not sure it would matter, but when I top off the black tank. I use a 1 gal bottle just for that purpose. Fill the bowl and open toilet valve. For 2 reasons, no over filling and no high water pressure filling tank.
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Old 10-20-2021, 11:00 AM   #4
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Mine was overfilled accidentally year 1 before I realized the sink flows into the black as well so at least it was clean. This happened as I was running the water to drain anti-freeze. I cut an access hole in the belly to drain it.

The water did NOT come up the toilet, it overflowed prior so I thought maybe this was a way to NOT flood the trailer.

In any event, if you drain when it gurgles it will be full but NOT completely full and you wont have to worry again.
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Old 10-20-2021, 11:37 AM   #5
jackparretta
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It's is the black tank , leaks even when i fill by holding flush pedel down to fill. thanks for all the reply I'm having dealer repair it under forever warranty
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Old 10-20-2021, 12:28 PM   #6
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Ohhhhh, it leaks even when flushing ....... understood.
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Old 10-20-2021, 01:00 PM   #7
Javi
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Just a note... the 333MKS has about 4 feet of 3" pipe running up to the toilet from the top of the tank. Probably shouldn't fill it up until you can see the water in the toilet...
Yep... that black pipe in the basement with the 45 degree elbows is what you're looking down into from the toilet...
Waaaaay over filling the tank.
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Old 10-20-2021, 06:39 PM   #8
chuckster57
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Quote:
Originally Posted by jackparretta View Post
It's is the black tank , leaks even when i fill by holding flush pedel down to fill. thanks for all the reply I'm having dealer repair it under forever warranty
I would make sure the “forever warranty” is going to cover it before I authorize any work. At $150.00- $175.00/hr. It can get very costly.
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