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Old 06-27-2014, 06:55 PM   #1
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Black Tank Vent?

Here's a question; in our 2005 KSDP 3910, is my black tank vented? Or maybe I should ask if it is SUPOSED to be vented? I find that when I dump the black tank, it does not drain out unless I open the grey tank too. I was thinking that I should not open them together to prevent odors from getting into the grey tank. Not a big deal, just a thought.

The reason I ask is that lately I have been getting clogs in the drop pipe from the toilet. I've learned to clear them, but wonder if the problem may be starting with the vent situation.

Any thoughts?

Tom
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Old 06-27-2014, 07:02 PM   #2
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Tom, to find out if you have a vent problem, with the water off, have someone hold the toilet drain open while you open the black valve. A good rush out will tell you that you do. If the same hapens, then I think not enough water.
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Old 06-27-2014, 07:22 PM   #3
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Thanks, but does that mean that it was built with a vent for the black tank?
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Old 06-27-2014, 08:41 PM   #4
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Yes, both tanks should be vented. They were on my 04DS.

If you go up on the roof there should be two vent pipes above where you water bay is. One is for the Grey the other is for the Black. A quick way to figure which is Black is to put your nose near them. It should be pretty obvious which is the black.

Another possibility is the vent is blocked. You should be able to pour down each vent pipe using a hose. Try this with both tanks empty and both dump valves open. The water should simply go down the pipe and out your drain line??? If water fills the vent tube, then it is blocked. Clearing it may be as simple as using a semi-stiff rod and run it down the vent pipe. You may have had a squirrel that thought this was a neat hiding place for his winter stash.

To take the top off the vent, there is a single screw in the depression that has caulk in it. Use a Phillips screwdriver and dig out the caulk to expose the screw. Then the top should simply lift off. If it breaks, they are about $2 at any rv store.

BTW, you also may have a vent pipe for you cloths washer. But this should drain into the gray tank.
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Old 06-27-2014, 09:17 PM   #5
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Thanks, Dan. When I got this thing last year, there was a vent cap missing. I replaced it, but now wonder if a rodent or insect may have built a nest in there. I'll check it out when I get the chance. As mentioned, the black tank will not flow out until I allow air in through the grey dump valve opening.

Thanks for the help. I'll get it taken care of.

Tom
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