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Old 11-27-2012, 12:17 PM   #1
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Black water tank fills with Grey Water

Dear RV Mechs: I have a new to myself 1996 Bounder 34H. I took the MH on an extended stay low support trip this past 9 days and discovered that the black water tank was getting filled with the grey water. We would shower and wash dishes for a day and half expecting to have no issues with our tanks but the black water was up to the rim. Upon a stop to the Flying J for a dump and a few more boon docking days again the black water tank was filled. I took a moment to try to see the logic and can only expect that the grey water is directly routed to the black water tank. I am guessing that you have this done when you are almost a permanent resident at an RV park and you need to keep the dump water high????? Any other ideas out there?
Craig Gosselin
1994 Fleetwood 33H
1995 Fleetwood 30H (parts vehicle)
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Old 11-27-2012, 01:25 PM   #2
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Some coaches will have the bathroom sink routed to the black tank, but I don't see a reason to have everything routed there. Time to crawl around under the coach and see what you can see of the plumbing.
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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Old 11-27-2012, 03:51 PM   #3
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Time to check out the routing of the plumbing. My 1st thought is that the previous owner re-routed to the black tank. Could be the gray tank is leaking or some other issues. Some people will also do this to gain more gray capacity since the gray tanks seems to fill much faster than the black tank.
Are you getting any indication of water in the gray tank?
Don & Bunny
05 Discovery
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Old 11-27-2012, 05:08 PM   #4
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Get some food dye for the next time you go to a park with full hook up. Attach slinky with a section of clear drain line. Empty both tanks. Mix up a gallon of water with a dye color, pour it in a drain. Pull the handle of each tank and see which one has that color. Mix another gallon of color, pour in another drain and pull the handles. Repeat until you've mapped out how the drains are plumbed.

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 11-27-2012, 05:30 PM   #5
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One other possibility is if you have the actual drain to the dump line closed AND both the black and grey open, water from one will travel into the other. Given typical usage you'll probably use 10 gallons of grey to one of black.
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Old 11-28-2012, 08:55 AM   #6
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BFlinn....that is a great idea. Fred....I am looking into the dump valve set up this evening. I have seen that there has been some plumbing work on this rig. The hot water system and some plumbing replaced. Possibly due to freeze damage.
Craig Gosselin
1994 Fleetwood 33H
1995 Fleetwood 30H (parts vehicle)
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Old 11-29-2012, 05:56 PM   #7
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Back in this period of time, Some engineer came up with the great idea to route grey water into the black water tank to help keep the probes clean. Even Airstream did it for a couple of years. Most of the time it was the bathroom sink into the black tank. They stopped when all the dealers and customers started raising hell. This only proves that the people who design the campers don't use them. ( at least not anywhere other than resort campgrounds)
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32 years mechanic at Delta Air Lines 15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.
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tank, water

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