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Old 09-29-2018, 04:58 PM   #1
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Black tank

Hello all. We have a jayco Melbourne 28f . I have recently noticed when we dump the black tank that the digital display does not show that it is empty, when in fact it is. I think that there is toilet paper or something stuck on the sensor. Not too sure what is going on here any ideas On how to get the display to read empty. Thank you all

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Old 09-29-2018, 05:50 PM   #2
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Give it a nice long rinse with the black tank flush. That should take care of any dirty sensor issues.

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Old 09-29-2018, 06:14 PM   #3
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After you dump it put some dawn or pine sol in it with a few gallons of water and go for a drive. Cleans it right up.

I always use pine sol after dumping. Get the original from Dollar store as it still has pine oil in it. It will clean, disinfect and lubricate all your sensors and valve seals.

Never let you tanks sit empty. Any paper or solids will become glued to the sides. Always put a fresh charge and several gallons of fresh water back in the tank.

In the winter add a gallon of RV antifreeze to the water. Never leave it empty!
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Old 09-29-2018, 06:41 PM   #4
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Don't put to much faith in those displays, it is still the same since the 60's, useless old technology, You will know after awhile the use of the system.
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Old 09-29-2018, 07:58 PM   #5
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On the morning that we are heading home from a trip, I always give the black tank more service than normal. I'll dump and flush four or five times instead of the normal three. When I flush, I close the valve and let the black tank fill partially then open the valve and dump everything. I hate to waste water, but if you don't properly clean the tank, and flush, flush, flush, you will have problems.

After five flush cycles at the end of our last trip, the water was running perfectly clear, so I was happy with the results. As Cabinetmaker wrote, I always add Pine Sol or laundry detergent or dish detergent, or a combination thereof with 4 gallons of water and let it slosh around in the tank on the way home. The trip home was less than 200 miles and for some unknown reason, instead of keeping the solution in the tank until the next excursion, I dumped the tank when we got home. Needless to say I was surprised at what I saw coming from my black tank. I expected more clear water, but it definitely wasn't. So even though I thought I got it all, there was more there. So now I'll do one more flush when we arrive at home.
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Old 10-07-2018, 10:45 AM   #6
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Thank you all for your knowledge. It worked and we got the black tank to read Empty. Yay
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Old 10-07-2018, 11:18 AM   #7
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Originally Posted by Gmward69 View Post
Thank you all for your knowledge. It worked and we got the black tank to read Empty. Yay

, but WAIT What did you try that worked for you?

Some of us are dedicated 'black tank flushers' and keep water in the black tank and have little or no success with chemicals to get the sensors to read correctly. Inquiring minds want to know...
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Old 10-08-2018, 01:32 AM   #8
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I also heard that flushing some crushed ice down the toilet just before driving away gives the black tank a good scrubbing. I never tried this myself though.
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Old 10-08-2018, 03:02 AM   #9
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We have been using a product named Tank Tech, Before using we flushed, flushed, and flushed the tank through the toilet. Then ran the tank flush for about 15 minutes. Afterwards we added about 2 ounces of Tank Tech and topped off with about 1/2 tank. Let it sit until we went camping. Drove about 300 miles, parked, finished filling the tank, did the dump and flush. Sensors all showed empty For the first time that I can remember! Still using the stuff and occasionally dump it into gray water with same good results. No I'm just a camper with no ties to the product.
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Old 10-08-2018, 06:08 AM   #10
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I often wonder where they place the nozzle for the black tank flusher. If they place it on the same side as the sensors it may not clean them. I think the optimum placement would be opposite the sensors so the stream of water hits them and cleans any gunk off the sensors.

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