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Old 09-25-2017, 07:32 PM   #1
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Black Water tank

I cannot completely empty my black water tank. I tried several times and for some reason it will not empty, any ideas
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Old 09-25-2017, 07:35 PM   #2
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How do you know the tank is not empty? If by the tank level indicators the sensors in the tank may be giving a false reading.
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Old 09-25-2017, 07:39 PM   #3
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Look into the toilet
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Old 09-25-2017, 07:42 PM   #4
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How do you know the tank is not empty? If by the tank level indicators the sensors in the tank may be giving a false reading.
X2 on that. if you have leveling jacks try raising the curb side a bit to help the stuff run downhill into the sewer hose.
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Old 09-25-2017, 07:44 PM   #5
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Looking into the toilet can fool you. The bottom of the tank is usually only about 6" from the pipe and the remaining 1/4" of water can make you think you're looking at more than you really are. Only way to know for sure is to "stick" it. Be sure to use a disposable "stick".

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Old 09-25-2017, 09:07 PM   #6
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Due to the shape of my tank, I don't see any water until it has about 15 of the 24 gallon tank capacity.
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Old 09-25-2017, 09:16 PM   #7
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Should use plenty of water when flushing so no build up of material will happen in tank,
You can take a steel fish and flip around in tank to loosen up material in tank or a few bags of ice and drive the coach around over dipping roads to move thing around.
Be careful can be messy.
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Old 09-26-2017, 09:24 AM   #8
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This forum seems to highly recommend Happy Camper Extreme for your situation. I haven't tried it myself to say for sure.
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Old 09-26-2017, 07:01 PM   #9
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I cannot completely empty my black water tank. I tried several times and for some reason it will not empty, any ideas
Before you attempt to empty the tank how full are you filling it?
Just pulling the handle and letting the waste drain out with no head pressure will let the tank build up with solids and never will completely drain entirely.
Fill the tank to maximum capacity and yank the handle and let it empty completely. Repeat the process until you are sure you are getting everything out of the tank. This may take several attempts before you are successful. From that point on always fill the tank before pulling the dump handle to prevent the dreaded pyramid and a solids build up in the tank.
Is this a new or older unit?
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Old 09-27-2017, 05:55 AM   #10
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Put your MH information into your signature
Take a couple of minutes to fill out your signature with information about your motorhome (MH). This will really help in all future posts, so you don’t have to type it in each time.
You do this by:
1) Going to the top of this page and click the top left tab named “User CP”
2) Look at the menu on the left and scroll down to “Settings & Options” and click “Edit Signature”
3) In that text box type all the information about your MH. Year, model, length, mileage, any aftermarket extras installed and so on.
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Old 09-27-2017, 06:25 AM   #11
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Put your MH information into your signature
Take a couple of minutes to fill out your signature with information about your motorhome (MH). This will really help in all future posts, so you don’t have to type it in each time.
You do this by:
1) Going to the top of this page and click the top left tab named “User CP”
2) Look at the menu on the left and scroll down to “Settings & Options” and click “Edit Signature”
3) In that text box type all the information about your MH. Year, model, length, mileage, any aftermarket extras installed and so on.
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Old 09-28-2017, 07:03 AM   #12
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Originally Posted by marjoa View Post
Put your MH information into your signature
Take a couple of minutes to fill out your signature with information about your motorhome (MH). This will really help in all future posts, so you don’t have to type it in each time.
You do this by:
1) Going to the top of this page and click the top left tab named “User CP”
2) Look at the menu on the left and scroll down to “Settings & Options” and click “Edit Signature”
3) In that text box type all the information about your MH. Year, model, length, mileage, any aftermarket extras installed and so on.
You might be thinking the same thing I am. If this is a new unit There might be a restriction in the tank caused by the plastic disc left from cutting the hole for the inlet pipe into the tank. This could partially block the drain outlet and allow solids to build up behind it.
If it is an older unit it may have been left for a long period of time with the tank partially full, the liquid evaporated out and the solids left behind may have hardened near the tank drain outlet.
We need more info to really be of help.

Lynn
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Old 09-28-2017, 07:20 AM   #13
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1) Fill your tank and dump as you have been and drain gray water.
2) Fill your tank to at least 75% with hot water that has a generous dose of Dawn and Pinesol. Completely fill your gray water tank with clean water.
3) Take the coach for a 20-30 minutes ride with a copious number of left / right turns and entries into driveways that will agitate the tank further.
4) Dump the black tank.
5) Use part of the gray tank to backwash the black tank and drain black tank.
6) Repeat #5 twice more.
7) Empty black tank. Use a clear section of a connection to make sure that the backwash is clean.

If that doesn't work, you are going to have to go at it from both ends with high pressure.
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