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Old 06-05-2015, 10:34 PM   #1
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Black Tank Valve Not Closing Completely

I recently noticed that our black tank is draining with the the valve control in the closed position. The valve control feels like it's working normally, but when the valve control is pulled to drain the tank, nothing is coming out of the hose. We have been at a full hook-up site for a month, and the tank is not even close to full, leading me to think the drain valve is either wide open or partially open allowing the tank to remain drained. Any ideas as how to get it closed again and working properly?


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Old 06-05-2015, 10:44 PM   #2
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Quote:
Originally Posted by Mark and Becky View Post
I recently noticed that our black tank is draining with the the valve control in the closed position. The valve control feels like it's working normally, but when the valve control is pulled to drain the tank, nothing is coming out of the hose. We have been at a full hook-up site for a month, and the tank is not even close to full, leading me to think the drain valve is either wide open or partially open allowing the tank to remain drained. Any ideas as how to get it closed again and working properly?


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More than likely has a little something stuck in the mechanism.

If you have a flush valve, you can connect a hose and fill it up then flush it a few times...hopefully will clear the blockage. (My gray tank has a little block but flushing it a few times seemed to fix it.)

While emptying it, open and close the valve a few times while water is flowing out.

Good luck!
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Old 06-07-2015, 12:32 PM   #3
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We have an older 34ckts that had a slow leak from the black water tank.

I had used the tank flush built in to the rv until the water ran clear trying to fix it. Still leaked....well I assumed it was a slow leak because unlike you ours would have water in it when I dumped after 5 days but nowhere near what I would expect.

I ended up going to wally world and getting the camco reverse flush adapter MAINLY because it is clear...goes on the dump and I could see for sure if I was slow leaking. Sure enough I could see for sure now it was a slow leak and more so now I can see when it was fixed.

Also I can see when I use the tank flush system when the solids stop. Amazing what gets left behind even when you dump a full tank.

I decided to use the reverse flush function since it had it even though the built one I had used multiple times.

Not expecting much I turned it on. Well after about a minute gunk and solids started coming out. Ran it for maybe ten minutes. Never had a problem since.

All I can figure is that the built in sprayers are not aimed at or directly spraying on the valve area and I must have had some seriously dried or stuck solids. SInce the cheapo Camco one sprays a jet nozzle spray back up the drains it must have cleared whatever was built up around the valve.

Supposed to work best if it is straight shot from the dump to the tank valve but mine isn't...still worked good. Still use it once a month and still washes stuff out the built in does not.

At least with it being a clear fitting I can see whats coming out.

Just my experience.
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Old 06-07-2015, 01:17 PM   #4
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Going to Camping World tomorrow! Thanks for the info everyone!
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Old 06-07-2015, 01:26 PM   #5
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You may also closed the valve and caught some tissue in the groove of the slide valve. This stops the slider from sealing all the way into the seal. If this is a fairly new unit, it is VERY common to find the round blank from the hole saw still in the tank and it gets washed around and down to the drain. If it's the smaller vent blank it can get caught easily.
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Old 06-07-2015, 01:44 PM   #6
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In an emergency I have this till I get a chance to fix it.
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Old 06-07-2015, 02:27 PM   #7
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Mark, while there pick up some holding tank " digester " by Thetford. It works great to clean stubborn deposits and tissue from your tank and sending units. Thetford makes most RV toilets.
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Old 06-08-2015, 12:57 PM   #8
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Black tank

This may help in the future. I've been RVing for 7 years and I have a routine when dumping the black tank. First I use a clear adaptor just before the sewer hose and while flushing I can see when things run clear. I also fill and dump the toilet while flushing 4 0r 5 times at least every other time I dump. Have never had a problem with the tank valve. You'll be surprised what filling and dumping the toilet loosens up.
Good Luck and Happy RVing!
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Old 06-08-2015, 01:27 PM   #9
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Thanks for everybody's input! I didn't know there were items available to help in flushing out the tanks. I just ordered the Camco 39062 Dual Flush Pro Holding Tank Rinser with Gate Valve from Amazon, this looks like the perfect solution. You can see if anything accumulates behind the valve when the tanks are closed and the tanks leak and you can rinse out the tanks without a mess. I used to either run a hose into the toilet to flush out the tank (hit or miss) or I would shove a water hose up the drainpipe to rinse out the tank (messy). The Camco 39062 Dual Flush Pro Holding Tank Rinser with Gate Valve seems to be the perfect solution. I'll get a chance to try it out when I go camping next week.
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Old 06-08-2015, 01:31 PM   #10
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Could be toilet paper. Tends to stick in valve seal. Try the flushing described. Use rv toilet paper. The clear adapter is critical to see how flush is going.
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