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08-19-2022, 12:24 PM
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#1
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Junior Member
Join Date: Sep 2021
Posts: 29
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holding tank locations and access
I am having some trouble with my middle bathroom black tank, it seems to have a strong sewer smell most of the time, much worse than the rear main bath, and the flush system does not work on that tank. Also in that same bath the toilet tends to burp at you when you flush, so Im thinking a tank vent issue. does anyone know how to access that tank in order to check it out. I have a 2019 43 foot cardinal luxury 3700 with front living and rear main bath, with half bath off the kitchen area. do I have to pull the entire underbelly off the trailer to get to it? because i don't know if I'm up for that. my underbelly is all one piece and it would take a whole day just to get it off.
Thanks for any advice !!
Randy
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08-20-2022, 03:36 PM
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#2
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Senior Member
Join Date: May 2016
Location: Michigan
Posts: 284
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Randy, are you sure that tank is getting emptied? Mine bubbles up when flushing when its getting full.
Otherwise, I agree, sounds like a venting problem. Sorry, no advice to give, I have a 3850rl
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08-20-2022, 03:52 PM
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#3
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Junior Member
Join Date: Sep 2021
Posts: 29
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Yes I’m sure. The Rv stays in a permanent space at an Rv park and only gets used on weekends. So never here more than 2 days at a time and ranks get drained and flushed enemy time we leave. I want to fix flush system on this front black tank but can’t find access to it from inside trailer. I know tank is directly under toilet because I can look down and see the bottom of tank through the toilet.
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08-20-2022, 07:20 PM
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#4
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Senior Member
Join Date: Feb 2018
Location: TEXAS
Posts: 9,208
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You're probably going to have to get a toilet cleaner wand and rinse it from the top.
https://www.amazon.com/Camco-Rinser-...23020441&psc=1
__________________
2015 Dynamax REV 24TB class C
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08-21-2022, 08:38 PM
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#5
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Senior Member
Join Date: Nov 2020
Posts: 338
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Double check your cap on the vent where it sticks up on the roof. I have heard where they stuck the cap all the way down on the pipe, effectively closing off the ability to "vent".
Other thing to add, my black tank was giving problems and I thought the valve stuck closed because when i pulled the handle nothing came out.
It turned out when the factory glued the pipe ends to the valve they slobbered so much glue on the fitting it ran into the groove on the valve and kept it from closing all the way.
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08-23-2022, 08:27 AM
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#6
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Junior Member
Join Date: Sep 2021
Posts: 29
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Don’t have any problems draining any of the tanks, they all drain fine, that’s another weird thing, if there were no vent on the black tank I wouldn’t think it would drain well due to airlock. I checked the two vents on the roof right in that area, when I pulled the caps off one vent looks fine and the other one was not there. There wasn’t even a hole cut into the roof. It is just the roof vent screwed down to the roof with no hole or pipe coming through. Do you think that is wheee the vent was supposed to be and they just didn’t put it in?
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08-23-2022, 07:43 PM
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#7
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Senior Member
Join Date: Nov 2020
Posts: 338
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That is very odd, but nothing about RV construction (or lack there of) surprises
me. Have you tried removing the interior panels in the basement? You should be able to see in there some of the piping, tanks, vents.
If they didn't run the pipe up through the roof, that would account for sewer gas smell.
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08-24-2022, 10:23 AM
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#8
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Junior Member
Join Date: Sep 2021
Posts: 29
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So this middle bathroom is not near the basement area. I wonder if they tied the black tank vent into the grey tank vent stack somewhere in the wall and only took that one vent line out through the roof ?? Who knows, I will never find out until I can see the tank and it’s plumbing which means I will probably have to drop the entire underbelly.
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08-24-2022, 12:18 PM
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#9
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Senior Member
Join Date: Nov 2020
Posts: 338
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My Cardinal LTD 3600 has a grey galley tank that handles the shower and the kitchen sink.
It doesn't have a vent through the roof. All I have been able to find is the cheater vent under the kitchen sink. It seems hard to believe that would be how they vent the tank.
Do you have any cabinets or closets near that tank that may have a panel that can be removed? There may be a cheater vent that has gone bad and letting the fumes come in. Those vents are cheap and they do go bad.
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08-24-2022, 01:58 PM
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#10
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Senior Member
Join Date: Jun 2012
Location: Southern NM
Posts: 9,560
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Quote:
Originally Posted by FirstFiver
My Cardinal LTD 3600 has a grey galley tank that handles the shower and the kitchen sink.
It doesn't have a vent through the roof. All I have been able to find is the cheater vent under the kitchen sink. It seems hard to believe that would be how they vent the tank.
Do you have any cabinets or closets near that tank that may have a panel that can be removed? There may be a cheater vent that has gone bad and letting the fumes come in. Those vents are cheap and they do go bad.
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Air admittance valves (usually under sink) are mainly used in addition to a roof vent, rarely in place of. But yes, they do go bad and can allow smells to escape. Cheap and easy to replace.
Are you sure your gray and black tanks do not share a roof vent? I have seen many RVs that the waste tank vents plumbing is joined at some point to use one roof vent.
__________________
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD Duramax
Reese Fifth Airborne Sidewinder
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08-24-2022, 02:46 PM
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#11
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Senior Member
Join Date: Jun 2021
Location: Central coast Calif.
Posts: 726
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The toilet doesn’t happen to be a Dometic 300 ?
__________________
Cross-threading works better than blue loctite.
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08-24-2022, 09:21 PM
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#12
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Senior Member
Join Date: Nov 2020
Posts: 338
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Quote:
Originally Posted by NMWildcat
Air admittance valves (usually under sink) are mainly used in addition to a roof vent, rarely in place of. But yes, they do go bad and can allow smells to escape. Cheap and easy to replace.
Are you sure your gray and black tanks do not share a roof vent? I have seen many RVs that the waste tank vents plumbing is joined at some point to use one roof vent.
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I can see my galley tank and the black tank vent. The black tank vent goes up the wall and comes out the roof. The galley tank has no where else to vent except that same wall and there is no other vent pipe there. The rest of the galley tank is under the kitchen floor and there is no place a vent can come up in the kitchen. The kitchen sink is in the island.
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08-26-2022, 07:54 AM
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#13
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Senior Member
Join Date: Nov 2020
Posts: 338
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OP, if this is the 1/2 bath tank look for the valve in the vanity sink cabinet.
I couldn't imagine Cardinal piping that vanity sink into another grey tank. They probably would have just piped it into the black tank for convenience.
Try changing that valve and see if the fume situation improves.
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09-01-2022, 08:58 PM
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#14
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Senior Member
Join Date: Jun 2015
Location: Albuquerque
Posts: 1,228
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If your entire system is plastic, you can use Oxyclean to control the smell. It will corrode any metal it comes in contact with. We had a houseboat black tank that wasn't vented. It always smelled. Oxyclean was our friend, but it was an aluminum tank. When we replaced the tank, we put in a vent that works, and haven't had a smell issue since.
__________________
2009 Roo 21ss + 2007 Superduty 6.0
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09-06-2022, 01:21 PM
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#15
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Senior Member
Join Date: Mar 2013
Posts: 339
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Quote:
Originally Posted by kr1928
I am having some trouble with my middle bathroom black tank, it seems to have a strong sewer smell most of the time, much worse than the rear main bath, and the flush system does not work on that tank. Also in that same bath the toilet tends to burp at you when you flush, so Im thinking a tank vent issue. does anyone know how to access that tank in order to check it out. I have a 2019 43 foot cardinal luxury 3700 with front living and rear main bath, with half bath off the kitchen area. do I have to pull the entire underbelly off the trailer to get to it? because i don't know if I'm up for that. my underbelly is all one piece and it would take a whole day just to get it off.
Thanks for any advice !!
Randy
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Try using Happy Campers tank treatment after you dump and flush. Also, check that vent stack isn’t blocked in some way.
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