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Old 07-31-2017, 07:49 AM   #1
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Black & Gray Water Not Draining

Everything has been working so far on the 2001 T2975 that we just bought, but when we went to drain the black water (attached hose and pulled lever out) there was only a dribble. Nothing came out for gray water either. Is there another toggle? I can't find detailed instructions in the downloadable manual and we're totally new to this, so any suggestions would be very much appreciated!
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Old 07-31-2017, 02:55 PM   #2
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Maybe a silly question, but you dont mention using it... is there waste water in the tanks?
If just going by the level meters they aren't always accurate.
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Old 07-31-2017, 03:23 PM   #3
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We removed the toilet as we will be switching to a composting toilet in the same spot. There is liquid visible in the waste tank about 10 inches below the floor. The trailer was plugged into power when we were viewing it to buy, at that time the meters raid that there was water in the fresh and gray tanks, but the black water indicator did not light up.
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Old 07-31-2017, 03:25 PM   #4
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There is no other "toggle". I've heard of vents being clogged or dropping down into the tanks. Other than that it would have to be the valves themselves.
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Old 07-31-2017, 06:00 PM   #5
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If there is water in the gray tank, that "should" drain out. There are no other levers or valves to open other then sliding dump valve, one for gray water, one for black water.

The black water tank may have a clog in it. If the prior owner did not do the proper tank maintenance and fill the tank with some starter water before using the toilet, all the solids clump up and will not float.

You stated you could see water 10" down. If this is an actual 10", that is very far down. The floor is only approx 2" thick. That leaves 6" of air in the tank before the water. If the camper is on an upward tilt away from the dump hole in the tank, water "might" stay trapped inside on the up hill side.

You can try pouring 5 gallons of water from a bucket in the tanks and see what happens. If you have a clog on the black tank, see this post for some help. Start from here and read to the end. http://www.sunlineclub.com/forums/f7...tml#post135567

If the gray tank is plugged, that is odd but not impossible. If you fill the gray tank from the shower, water will back up in the shower when the system is totally full. I would try 5 gallons and see if it comes out, if not then this one may take some Happy Camper Extreme cleaner or Tank Tech's to break it down in "time". It might take a week or more. I would really have to think hard on using any of the commercial acid cleaners on an RV tank. They could/can erode the tank probes inside the tank and may eat into the seals of the dump valve.

Hope this helps. Let us know how it goes.

John
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