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Old 01-19-2016, 06:26 AM   #1
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Sensors in gray water tank stay on when empty.

When my tank is empty I still have 3 lights on saying it is 2/3 full. Is there a way to get them clean?
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Old 01-19-2016, 06:45 AM   #2
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When my tank is empty I still have 3 lights on saying it is 2/3 full. Is there a way to get them clean?
Wingman139... Take a look at this video
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Old 01-19-2016, 07:09 AM   #3
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Another way: Install Camco Tornado internal tank flusher next to grey tank sensors. You will be amazed at what you flush out of your grey tank. Thru the tank wall sensors and external ones all work like they were new.
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Old 01-19-2016, 07:25 AM   #4
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Old 01-20-2016, 05:16 AM   #5
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Prior to leaving on trips I have used 5 gallons of water in the tanks with dishwasher liquid [1cup] along with a softener to limit the suds, it is left in the tank and dumped upon arrival at the campground. More water can be used if needed. It is washing around in the tank as you travel. I have not had any trouble. I do this with new purchases as well not knowing the condition of the tank. I'll do it several times through out the season. Good luck.
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Old 01-20-2016, 06:34 PM   #6
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I have the same problem with the black tank sensors. Will detergent work on the black sensors too?
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Old 01-21-2016, 06:58 AM   #7
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It does work on all sensors, helps clean the sensors. It also helps with any build up that may remain in the tank that may have hardened over time and does not fully empty. Do this several times during the season. Just empty the tank upon your arrival at your site and repeat as many times as needed.
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Old 01-21-2016, 01:55 PM   #8
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It does work on all sensors, helps clean the sensors. It also helps with any build up that may remain in the tank that may have hardened over time and does not fully empty. Do this several times during the season. Just empty the tank upon your arrival at your site and repeat as many times as needed.
Next trip out I will try this. My sensors are hinky now.

I think it will be awhile thou.... 18-24 inches of snow tomorrow is forecast and I have NEVER driven the rig in the snow.
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Old 01-21-2016, 02:10 PM   #9
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Best way is to put black tape over the monitor and stop worrying about those faulty indicators.

Camping is about having fun

If you use your RV you know how long you can go before having to dump.

Besides..
Toilet burps at you...time to dump black tank'
Sink/shower draining slows down.....time to dump grey tank'
Water pump goes burrrrrrp......should have already added more water
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Old 01-21-2016, 02:20 PM   #10
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The problem is not the sensors being dirty but is due to the tank walls being gunked up and fooling the sensors.

Even the non-contact sensors on the outside of the tank can be fooled if the walls are cruddy enough. SeeLevel even points this out on their web site.

The SeeLevel web site says "If sludge buildup in the tank becomes extreme the gauge will cease to operate (the tank will always read empty), so by monitoring the signal level the tank can be cleaned before the buildup gets excessive".
From HERE

Anything you do to help keep the tank walls clean may help.
Flushing, adding some detergent and water before you drive for a day or so might help.

I have the TrueLevel non-contact system that Winnebago went standard with in 2005 and right now my black tank reads full when empty. The gray tank shows 2/3 full when empty.

Over the eleven years we full timed I tried everything people say will work and nothing worked.
If I pressure wash the inside of the black tank (have done that twice), the level will be measured normally for a few months and then start to lie.

I think the problem is worse for full timers and that may be why some weekend or short term campers find that detergent or some other method works for them.

I just dumped it every ten days and didn't worry about it anymore.
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Old 01-22-2016, 07:01 AM   #11
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Next trip out I will try this. My sensors are hinky now.

I think it will be awhile thou.... 18-24 inches of snow tomorrow is forecast and I have NEVER driven the rig in the snow.
Good luck, Hopefully your ready and stay at home. Watched it coming and I was hoping for a miss up here. We had enough last year. Good luck.
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Old 01-22-2016, 08:51 AM   #12
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Putting ice in the black tank and driving around breaks down the buildup and can stop the false reading. Tried it once, seemed to work OK. Should work in grey tank also.
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Old 01-22-2016, 11:07 AM   #13
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Putting ice in the black tank and driving around breaks down the buildup and can stop the false reading. Tried it once, seemed to work OK. Should work in grey tank also.
Not sure how you'd get a bag of ice into a gray tank??
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Old 01-22-2016, 03:49 PM   #14
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A long time ago I read about using 20 Mule Team Borax. Thought I would try it and now use it every time we move! (we fulltime and move only every three months or so) We dump half a box into the gray and black tanks with at least a third tank of fresh water and go on down the road. When we dump at the next stop it's amazing the crud that leaves thru the clear hose connection I have from both the gray and black tanks! Amazing. That is the only thing I do to keep the tanks "clean" except for the blasting of the black tank with the built in tank flush system when dumping. The tank sensors always work perfectly.
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