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Old 02-25-2021, 08:30 AM   #1
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What vents pressure from grey tanks?

As water fills the grey tanks I would expect the air in the tanks to compress and pressure to build up.
What is supposed to keep that from occurring?

Both of my grey tanks seem to back up into the kitchen sink and shower pretty quickly. They didn't used to do that. It used to take several days in the kitchen. It's hard to imagine we run 30 gallons of water in our kitchen faucet every day. Even the shower backs up now after 1 shower.

Perhaps these tanks aren't getting vented properly?

thanks,
Dustin
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Old 02-25-2021, 08:49 AM   #2
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The holding tanks are vented thru the roof. You will see up on the roof the vent caps. Check then for any obstructions.

Just some clarification are you saying they drain slowly or you have water backing up into them?
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Old 02-25-2021, 11:39 AM   #3
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I believe he means it just fills up quickly because he said; “ grey tanks seem to back up into the kitchen sink and shower pretty quickly.” Does sound like maybe something is obstructing the vent pipe. Just depends on how much water you use. Doing dishes and taking a shower will fill it faster than you think. But you did say it didn’t use to fill so quickly.
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Old 02-25-2021, 12:44 PM   #4
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After the sink or tub backs up with grey water does it eventually drain or stay backed up as if your grey tank is full?
Maybe go on the roof and take the cap off of the vent and run a plumbers snake down inside to ensure that there is no blockage of any sort.
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Old 02-25-2021, 12:58 PM   #5
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If he is located somewhere that got the recent deep freeze could be a ice build up in the tank taking up some of the volume. I think we need more information please.
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Old 02-25-2021, 01:14 PM   #6
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So did some research and it seems that camper has 1-60 gallon gray tank.
If when the kitchen sink or the bathroom sink drains and it then runs up in to the shower - water seeks its own level- the the tank would be full. Usually when the roof vents are plugged it affects the tank draining. If severe it will "pull" the water in the traps out to vent itself.

Take a gallon milk jug and turn it upside down --glug-glug-glug. Then put a hole it the bottom and it drains straight out.

Just like Paul Harvey we need the "rest of the story"
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Old 02-25-2021, 03:26 PM   #7
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Quote:
Originally Posted by sjk1998 View Post
After the sink or tub backs up with grey water does it eventually drain or stay backed up as if your grey tank is full?
Maybe go on the roof and take the cap off of the vent and run a plumbers snake down inside to ensure that there is no blockage of any sort.
Using a plumbers snake on any plumbing in a rv wouldn't be recommended, lots of plastic.
A water hose with a pressure nozzle would be safer than the snake.
If insects, birds or just debris has collected around those cheap vent caps it won't be vented & not drain.
Fortunately it's the grey tank, still yucky but not poop, so if needed you could open the drain & shove a hose into it backwards & possibly move any obstruction.
It's also not uncommon for the factory guys to drop the cutout from the tank into the tank & finally wash/float to the drain keeping it from draining.
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Old 02-25-2021, 03:41 PM   #8
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I use the Geo Method on my gray tanks also. Cleans all the oil and sludge remaining in the tank. I then run the sinks and shower water for at least 5 minutes to flush out remaining residue.
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Old 03-04-2021, 05:04 PM   #9
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Those vents are notorious for wasp/hornet nests. If after checking the vent the problem still persists, you might have a clog in your grey tank drain line between the tank and faucets.
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Old 03-04-2021, 07:02 PM   #10
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What is the Geo method?
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Old 03-04-2021, 07:11 PM   #11
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What is the Geo method?

Here's what the Geo method is: https://sites.google.com/site/cbruni/
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Old 03-04-2021, 07:13 PM   #12
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It's also in our documents section.
https://www.crossroadsowners.com/for...hp?do=cat&id=3
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Old 04-06-2021, 09:01 AM   #13
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Check roof vents? Of now have small kids that wash hands without supervision? Or a hard piped tank flush system that has a bad valve? Never forget the grandma tale took grandchild camping w/ NEW RV and child went back to restroom before hiking; returned from hike to find faucet running and RV flooded :-(
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