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Old 06-28-2020, 04:45 PM   #1
richeyb
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Trouble draining black tank

Started draining black tank after 3 days camping. It appeared to be draining but when I pumped water through the Black tank flush the gauge stayed at 3/4 and none of the new water I added will come out. Appears to be plugged up somewhere. I drove home 2 Hrs thinking the bumps would help but still no drainage!
Any thoughts or tricks to try? Montana HC 380.
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Old 06-28-2020, 05:35 PM   #2
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Forget the gauge. They hardly ever work in the black tank. How did you determine that what you added wasn't coming out?
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Old 06-28-2020, 06:44 PM   #3
Neverhome
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Did you have the tank closed during those three days or did you leave it open? If you left it open you most likely have the dreaded paper pyramid. That being a dried out pile of pooh and paper that is going to be time consuming to remove. If it was closed and you are sure it is still full and you are not relying on the gauges that never work, you may want to ask if anyone threw anything other than toilet paper in there. Feminine napkins or baby wipes are prime reasons for plugging black tanks. There are several products available that can help clear out the clogs. I suggest you contact you local RV center for advice on what works best.


Good luck.
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Old 06-29-2020, 08:58 AM   #4
richeyb
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Thanks for the replies. I determined there was no flow out By watching the clean connector going into the ground. I normally do the black tank flush and watch for it to flow clear. Only problem with the Flush still on there was no flow.

Any idea how far below the tube that extends from the toilet into the tank is the bottom of the tank or the top of the tank?
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Old 06-29-2020, 09:11 AM   #5
Texan
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Get you a water hose' preferably garden hose with a twist nozzle' and turn wide open and stick it as far up in the drain as possible. If your stoppage is where the water comes out of the tank into the drain then hopefully the high pressure from the nozzle will wash out whatever is stopping it up.
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Old 06-29-2020, 09:39 AM   #6
mazboy
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so many questions. how many days did you have it closed before you dumped?


and, we've never used the gauge....usually wrong, even if it works.


we usually dump when nearly full, there are 2 of us and that is usally about 2 weeks or when it starts to burp. and it really does burp.
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Old 06-30-2020, 05:50 AM   #7
RMcNeal
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richeyb, try using a Flush King to back flush the tank. I have used one since we started with our TT years ago. Works very well to flush black and gray tanks. It's on our "must have" list of accessories. https://www.amazon.com/Valterra-Degr...s%2C291&sr=8-3
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Old 06-30-2020, 06:47 AM   #8
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The golden rule for black tank, lot of water little paper.
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Old 06-30-2020, 08:56 AM   #9
Gary F.
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this will clean paper off sensors and help clear tank works great better than tank flush on unit.

RV Flexible Swivel Stik
$19.97 $28.99
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Old Yesterday, 06:21 PM   #10
KRSEGUINE
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I sometimes put a little active yeast down the toilet. When I drain I don't drain it all. That way the yeast environment will continue. I've done this for a couple of years. No dreaded pile up.
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Old Yesterday, 07:28 PM   #11
Graham
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Back flush

I agree with Robert and Dianne...the backflush adapter is well worth it. We park our RV all summer at Shuswap lake in Canada. Things get built up and the back flush puts pressure on the blockage. Works great.
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Old Yesterday, 08:06 PM   #12
Docweems
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I have also used the flexible swivel stick with good success. When I have had a really plugged up black tank, I have also used a non drinking water hose and a stream nozzle that is non adjustable on the end of the hose. Threaded that down into the black tank and tried to get it into the general area of the discharge hole on the black tank and then turned on the water and continued to "work it " around. I have usually been successful. It is messy but at least it it worked and then I really flushed the tank out.
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