Good Sam Club Open Roads Forum: Black Tank Roof Vent and Bathroom Roof Vent Too Close?
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 > Black Tank Roof Vent and Bathroom Roof Vent Too Close?

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BFL13

Victoria, BC

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Posted: 07/01/20 12:53pm Link  |  Quote  |  Print  |  Notify Moderator

MrWizard wrote:

"I think the vents open pointing aft so the lid won't blow off if you leave it open a bit while driving. With the vent hood on, that lid should be safe from blowing off."

If the vent lid is open when driving
You will have a ram air scoop into the bathroom


True. So closed while driving even with vent hood. It could go on sideways as was mentioned. I could make the tank vent a little taller too a bit higher than the vent hood.

It is not that bad so an Air Wick or whatever they are called would probably do it too. I will do some more work on the drains etc and see how it goes. Meanwhile they finally are opening the campground we like to use in the summer with the Class C, so there's that! [emoticon]


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CapnCampn

Idaho

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Posted: 07/02/20 01:43pm Link  |  Quote  |  Print  |  Notify Moderator

I liked the idea to route the vent opening somewhere else on the roof.

It might look a little Beverly Hillbillyish, but who's looking on your roof anyway?

Regarding vent covers, since I put mine on, I don't think I've ever actually closed my vents. Well, maybe a few times if I know I'm going down a dusty road...
I wouldn't put them on backward or sideways though..

STBRetired

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Posted: 07/02/20 02:16pm Link  |  Quote  |  Print  |  Notify Moderator

I have MaxxAir II vent covers. If they were on backwards, I think the amount of air trying to be rammed into them at 65 MPH would rip them off the roof. My bathroom vent has a fan so I don't have your issue. If at all possible, I think the addition of a fan would be the best solution.


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Dusty R

Charlotte Michigan 48813

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Posted: 07/02/20 03:40pm Link  |  Quote  |  Print  |  Notify Moderator

Try an RV Venturi Vent cap/top on your black tank vent and/or gray tank vent. That fixed that problem on our '88 Mallard's black tank.

doxiemom11

Paris Michigan

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Posted: 07/02/20 05:22pm Link  |  Quote  |  Print  |  Notify Moderator

Are you sure it's not coming from the air admittance valve under the bathroom sink? They do wear out and will allow tank fumes into the rv. The grey smells as bad as any black. They are usually 2 or 3 of them in your plumbing. About $25 at any big box stores. Try that first.

BFL13

Victoria, BC

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Posted: 07/02/20 06:39pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the ideas. I am working on confirming the source of the whiff, which will take a few days. I have closed the roof vent and cleaning the drains more to see if there is any whiff after that, then if not, I will open the roof vent and see if any then to confirm my original suspicion.

The whiff is definitely black not grey when you can smell anything at all. The tank vent on the roof has the usual rain cap. The bottom of the vent at the top of the tank is visible and sealed, so it is not there. None of the grey drains has an air admittance valve, but that may not matter if there is no smell with the roof vent closed. I will know about that later.

It will all get solved after a while. There is no rush, and thanks to all for things to check.

enblethen

Moses Lake, WA

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Posted: 07/02/20 07:25pm Link  |  Quote  |  Print  |  Notify Moderator

I remember you saying you have a shower drain. It should have a P trap under the floor. If it dries up, fumes from the tank can come up through it. To avoid it from allow fumes you may seal it with one of the flat drain stops.


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ajriding

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Posted: 07/03/20 07:53am Link  |  Quote  |  Print  |  Notify Moderator

The black tank is not connected to the gray tank. The gray tank is the shower, sink water. The black is toilet only, so the P-trap from the shower or sink will not contain any black tank odors, though the gray has a bad smell all it's own.

Gross to drive around carrying your poo anyway, but the black tank is your poop. The vent is directly open to the black tank.
It is there #1 to vent gases bc the poop decomposes and gives off gas which expand and would otherwise inflate the black tank, or bubble up through your toilet, or try to, and would blow a geyser when you flush (open) the toilet...
#2 The vent also allows the black tank to empty fast as the vent keeps the outflow of material from creating a vacuum in the tank. You have a vent on your house plumbing also.
Black tanks stink. The fumes coming off the roof vent stink, and they can be smelled.
Keep the blue stuff in there, use the toilet sparingly, and empty and clean as often as possible.

If it is coming out of the roof vent and into your cabin air vent then, yuck, and moving the black tank vent outlet further away from the air vent will help.

Smell is not coming from the sink or shower.

The toilet gasket could be failing and letting smell out, but most likely is just the roof vent odors you smell.
I have walked by plenty of RVs and smelled their roof vent stack blowing slight odors of yesterdays chili a few times....

BFL13

Victoria, BC

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Posted: 07/03/20 09:00am Link  |  Quote  |  Print  |  Notify Moderator

deleted.

* This post was edited 07/03/20 10:16am by BFL13 *

wopachop

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Posted: 07/03/20 10:34am Link  |  Quote  |  Print  |  Notify Moderator

I vote for a fan. You want to cool the TC anyway during the summer. You can route the vent pipe further away but wind direction is never consistent. Can make one yourself relatively cheap with a computer fan and a piece of insulating foam.

To test your air valve wrap a plastic bag over it. I did that to my trailer 2 or 3 years ago to test my valve as the cause of odor. Just remembered its still on there!!!

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