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Old 05-20-2021, 08:50 AM   #1
Virvis
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I did something stupid with my black tank

So I was flushing out my black tank after I emptied it with the installed black tank cleaner on my BH312 that I hook the hose to on the side of my rig. I forgot to open the drain valve and overflowed the tank. So there was sewer water trapped between the floor and the plastic sheet that shields the underside of the camper. I took down the plastic sheeting and got all the nasty water out and hosed it out, sprayed with bleach to kill any bacteria etc. but now we get an occasional drip when to waste water is going into the black tank.

my question is, is there a check valve or anything on the tank that may have been damaged when it was overfilled. Is there anything that could be stuck? I still have the black plastic sheeting off and we will get a sewer smell every now and then. Any thoughts?
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Old 05-20-2021, 09:50 AM   #2
Lee
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I think that as long as the vent pipe ( the one that goes through the roof) isn't plugged.... you can't over pressurized the black tank.... Water would just flow out the vent pipe.
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Old 05-20-2021, 10:27 AM   #3
JRTJH
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Depending on the tank configuration, you CAN overpressurize it and not have effluent "flowing up the vent stack and onto the roof. The pressure to "push a column of water the 8-10' up to the vent stack opening is significantly more pressure then many black tanks can withstand...

Having an "occasional drip when flushing the toilet tell me that you've got a split black tank, probably somewhere close to the toilet fitting on the top of the black tank.....

You might be able to identify the damage with an inspection mirror or with a borescope (8MM camera to attach to your phone). If it's split, the tank will run around $350-500, labor at a dealership probably well over that, possibly approaching $1000+.

You might consider a "tank patch kit" or a "self help replacement"... Much cheaper that way....

If you elect a dealership repair, consider an insurance claim, after all that's why you have insurance.....
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Old 05-20-2021, 11:15 AM   #4
flybouy
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Also check the toilet seals. To John's point, the entire system (the tank, tank fittings, toilet seals, etc will be under pressure before pushing water up a 1 1/2" vent stack. The tank and fittings are designed to hold and gravity drain sewage. It's not designed to be a pressure vessel.
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Old 05-20-2021, 11:28 AM   #5
notanlines
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Jim, the pressure required to push the 'effluent' up and over the top of the vent pipe is in the neighborhood of 5 to 6 psi. Not much where a garden hose is involved, but a lot on that black tank, and especially on the area around the seals and mounting area for the commode.
On a more pleasant note, be thankful that you didn't decide to flush the commode while this was going on. Instant poo tsunami !
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Old 07-06-2021, 03:16 AM   #6
Virvis
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Black tank leak fixed

Just an update. When I overfilled the black tank, it actually cracked and was leaking where the fitting/dump valve is located. After draining the tank and getting things mostly dry, I used JB Weld on the crack and surrounding area. Been over a month with no leaks. Hoping it stays that way.
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Old 07-06-2021, 06:08 AM   #7
Hblick48
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I had a grey tank that cracked where the discharge valve connected to the tank. Used repair kit specifically made for holding tanks. Held for a while and then failed. Ended up replacing the tank.
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