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05-01-2016, 10:09 PM
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#1
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Senior Member
American Coach Owners Club
Join Date: Feb 2015
Location: San Antonio, Tx
Posts: 170
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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?
Tom
2014 Eagle
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2014 American Coach Eagle
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05-01-2016, 10:16 PM
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#2
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Senior Member
Join Date: Nov 2015
Posts: 26,692
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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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05-01-2016, 10:21 PM
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#3
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Senior Member
American Coach Owners Club
Join Date: Feb 2015
Location: San Antonio, Tx
Posts: 170
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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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2014 American Coach Eagle
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05-01-2016, 10:23 PM
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#4
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Senior Member
American Coach Owners Club
Join Date: Feb 2015
Location: San Antonio, Tx
Posts: 170
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Oh, and no hose connected to the flush system..
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2014 American Coach Eagle
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05-01-2016, 10:46 PM
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#5
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Senior Member
Country Coach Owners Club
Join Date: Aug 2015
Location: Santa Rosa, CA
Posts: 723
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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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Russ
1990 Country Coach Concept 36' Antares
2006 Jeep Wrangler X, Blue Ox Towbar
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05-01-2016, 10:50 PM
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#6
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Oct 2013
Location: northern IL
Posts: 2,557
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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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2014 Fleetwood Bounder 35k
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05-01-2016, 10:53 PM
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#7
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Oct 2013
Location: northern IL
Posts: 2,557
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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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2014 Fleetwood Bounder 35k
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05-01-2016, 10:54 PM
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#8
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Senior Member
Country Coach Owners Club
Join Date: Aug 2015
Location: Santa Rosa, CA
Posts: 723
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Quote:
Originally Posted by mojoracing
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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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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Russ
1990 Country Coach Concept 36' Antares
2006 Jeep Wrangler X, Blue Ox Towbar
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05-01-2016, 11:15 PM
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#9
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner iRV2 No Limits Club
Join Date: Oct 2012
Location: Colorado Springs, CO
Posts: 1,111
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Do you have one of those tank flush devices?
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Mark
1999 Bounder 32H Ford V10, 2012 Ford Focus, Pretty DW, 1 cat. Retired USAF
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05-01-2016, 11:17 PM
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#10
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner iRV2 No Limits Club
Join Date: Oct 2012
Location: Colorado Springs, CO
Posts: 1,111
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Quote:
Originally Posted by Rsponsford
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.
Sent from my iPad using iRV2 - RV Forum
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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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Mark
1999 Bounder 32H Ford V10, 2012 Ford Focus, Pretty DW, 1 cat. Retired USAF
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05-01-2016, 11:21 PM
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#11
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner iRV2 No Limits Club
Join Date: Oct 2012
Location: Colorado Springs, CO
Posts: 1,111
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Have you checked the water pressure, do much will cause things to leak.
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Mark
1999 Bounder 32H Ford V10, 2012 Ford Focus, Pretty DW, 1 cat. Retired USAF
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05-02-2016, 05:05 AM
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#12
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Senior Member
Join Date: Feb 2006
Location: NW Arkansas
Posts: 157
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Is it really 3/4 full or just indicating 3/4 full?
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05-02-2016, 06:22 AM
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#13
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Senior Member
American Coach Owners Club
Join Date: Feb 2015
Location: San Antonio, Tx
Posts: 170
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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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2014 American Coach Eagle
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05-02-2016, 01:49 PM
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#14
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Senior Member
Vintage RV Owners Club Spartan Chassis
Join Date: Aug 2000
Location: Cedar Park, Tx.
Posts: 449
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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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1995 BlueBird BMC 37
2013 Jeep Wrangler Rubicon Unlimited
1984 BlueBird Wanderlodge FC35RB-Sold
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