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Old 05-01-2016, 11:09 PM   #1
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Black tank filling by itself?

Ok, I posted this on the American Coach group on Yahoo, surely there is some expertise here also. This is my 2 day old, 2014 American Coach Eagle, bought new from a dealer who had two in stock.

Ok, so during the last two days since we brought the Eagle home and plugged into shore service and water, grey tank seems fine and empties well. The back tank is closed, but fills to about 3/4 of capacity in a day. Only my wife was home in the coach today, and there is no way she would even put a dent in the blank tank capacity! We have not observed any leaks, toilets running, or such. We have not used the washer...basically just shower, and normal toilet use. So, anybody see something like this before?

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Old 05-01-2016, 11:16 PM   #2
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Some MHS have bathroom sink draining directly to black waste tank.....either due to ease of routing plumbing drain lines or to add water to black tank

If using shower then I would suspect bathroom sink has also being used.

And if bathroom sink is being used do you turn water on/off when washing face, brushing teeth etc or just let the water run until done??

Next time you drain black tank........
After it is empty, leave drain valve open and run bathroom sink faucet.
Water starts draining back out then mystery solved.
If it doesn't ............try shower.
Maybe shower is plumbed to black tank


And then .......
Do you have a hose connected to 'flush system'
If so ----is water turned on and filling black water tank?
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Old 05-01-2016, 11:21 PM   #3
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Hello, thanks for the input. Yes the coach I just traded in had the sinks and washer machine plumbed to the black tank. Today, no water was used in the coach at all...by mid afternoon, black tank was 3/4 full.. It seems something is leaking that is filling the black tank......just don't know what?
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Old 05-01-2016, 11:23 PM   #4
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Oh, and no hose connected to the flush system..
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Old 05-01-2016, 11:46 PM   #5
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I'm sure someone will come along soon with helpful advice. I too have experienced this same phenomenon on occasion but have not solved the mystery. My house manual clearly states that only the toilet drains to the black water tank. Maybe somehow water can get siphoned through the toilet? 🤔


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Old 05-01-2016, 11:50 PM   #6
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If you are sure that none of the sinks are going to the black water tank, I would then suspect a toilet not sealing properly and leaking into the black tank. Could there possibly be a problem with washing machine if it drains into black tank?
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Old 05-01-2016, 11:53 PM   #7
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I would disconect from water after filling the fresh water tank and leave it sit with the pump on working off the fresh tank. That way if you have a leak in a toilet or something, you will hopefully hear the pump run when the leak causes the pressure to drop and this might help you track it down or eliminate part of the system from the suspect list. What about the dishwasher? It could be letting water into the grey tank.
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Old 05-01-2016, 11:54 PM   #8
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Quote:
Originally Posted by mojoracing View Post
If you are sure that none of the sinks are going to the black water tank, I would then suspect a toilet not sealing properly and leaking into the black tank. Could there possibly be a problem with washing machine if it drains into black tank?

I wondered about the toilet seal leaking too (and it has leaked on occasion), but the bowl does not automatically fill with more water when it leaks past the seal.


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Old 05-02-2016, 12:15 AM   #9
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Do you have one of those tank flush devices?
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Old 05-02-2016, 12:17 AM   #10
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I wondered about the toilet seal leaking too (and it has leaked on occasion), but the bowl does not automatically fill with more water when it leaks past the seal.


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Do they have a upper drain so if the bowl get to full it does not overflow? I dont know just asking.
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Old 05-02-2016, 12:21 AM   #11
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Have you checked the water pressure, do much will cause things to leak.
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Old 05-02-2016, 06:05 AM   #12
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Is it really 3/4 full or just indicating 3/4 full?
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Old 05-02-2016, 07:22 AM   #13
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Good morning all, thanks for all the suggestions......the toilets are electric, or vacuum flush of whatever they call them. I am going to see if they are leaking using the water pump idea! I will be back to the coach this evening.......my wife has been dealing with this for two days her self.....the electric toilets have a sensor that will not let them flush if the tank is full. So the night before last, when we discovered this, both toilets had the red sensor light on, and the black tank showed full. After dumping, the tank read empty, and toilet sensors showed green again, and toilets flushed fine.
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Old 05-02-2016, 02:49 PM   #14
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Are you running the A/C's? My coach has drains for the A/C's that are routed down through the walls and empty under the coach (so you don't get water stains down the side). Sometimes when these clog people will route the drains into the black tank vent (vs letting it drain on the roof or fixing the original drain problem).
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