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Old 09-04-2018, 01:52 PM   #1
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Black tank building pressure

Iíve noticed when Iím flushing my black tank it builds up pressure. I empty the tank then close the valve and add water with the flush. I usually go inside after a few minutes to check the level. I turned the water off and I went inside to check the level and I heard air or water escaping. I opened the toiled to check and boom, water all over. Isnít the vent supposed to prevent that from happening ? I know some people say to leave the valve open while flushing but I want to make sure everything comes out of the tank so I fill it a few times to make sure itís clean. Anyone know whatís going on ?
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Old 09-04-2018, 02:45 PM   #2
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Originally Posted by billydan91 View Post
Iíve noticed when Iím flushing my black tank it builds up pressure. I empty the tank then close the valve and add water with the flush. I usually go inside after a few minutes to check the level. I turned the water off and I went inside to check the level and I heard air or water escaping. I opened the toiled to check and boom, water all over. Isnít the vent supposed to prevent that from happening ? I know some people say to leave the valve open while flushing but I want to make sure everything comes out of the tank so I fill it a few times to make sure itís clean. Anyone know whatís going on ?
If you filled your tank too much and the level went higher than your toilet seal, it will do exactly what you described. The vent has nothing to do with it.

Bruce
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Old 09-04-2018, 03:35 PM   #3
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If you filled your tank too much and the level went higher than your toilet seal, it will do exactly what you described. The vent has nothing to do with it.

Bruce
I never fill it more than 1/3. Also when I look down the toilet I see water but itís just under the seal. Even when the tank is empty. It never seems to be empty. Is there a pipe that angles down into the tank or does it go straight down to the tank.
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