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Old 05-14-2012, 05:55 PM   #1
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Black tank always reads 2/3 full

My black tank reads 2/3 when empty. I'm assuming that it may be the sensor? We've really have put up with it for 2 years now. You all think I have a bad sensor? Does anyone make a universal sensor or should I try to get it from the dealer? If I replace the sensor do they typicaly screw out of the black tank or would I just have to disconnect it and re-drill a new hole in the same area for a replacemnt sensor?
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Old 05-14-2012, 06:03 PM   #2
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These black tank sensors are pretty much worthless IMO. "Stuff" gets on the sensor and you get false readings, and this is a constant battle even if you clean the tank and get them working again. Mine is reading 2/3 full right now as well with an empty tank. There are more high end level indicators which are available for purchase, some on this forum have done this mod..
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Old 05-14-2012, 06:43 PM   #3
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If you have the chance fill your black tank half full of water add a couple of those solid dishwasher tablets and drive to your camping area and dump when you get there or along the way, that may help clean it
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Old 05-14-2012, 07:35 PM   #4
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You may also try sending a couple bags of ice into the black tank, after filling it with water. Then tow the camper a ways. The ice and water will kind of "scrub" stuff off of the sensor. Has worked for me before, but sooner or later the sensor will "stick" again.
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Old 05-14-2012, 08:12 PM   #5
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My suggestion - use the eyeball method. When you flush look down the hole and see how full it is. They make a sensor that attached to the outside of the tank, but I just can't get myself to pay that much for it.



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Old 05-14-2012, 08:49 PM   #6
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Quote:
Originally Posted by Crabman View Post
These black tank sensors are pretty much worthless IMO. "Stuff" gets on the sensor and you get false readings, and this is a constant battle even if you clean the tank and get them working again. Mine is reading 2/3 full right now as well with an empty tank. There are more high end level indicators which are available for purchase, some on this forum have done this mod..
Yours reads 2/3 full right now empty, but when it's full does it read full or just always at 2/3?
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Old 05-14-2012, 09:35 PM   #7
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How about just pulling the sensor out and sticking my pinkie finger in there to tell.. Yep it's full!
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Old 05-14-2012, 09:37 PM   #8
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Anyone make an aftermarket sensor?
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Old 05-14-2012, 09:40 PM   #9
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Quote:
Originally Posted by wb2nco View Post
Anyone make an aftermarket sensor?

Pinkies are free though!!
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Old 05-14-2012, 09:43 PM   #10
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...and apparently more accurate!
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Old 05-14-2012, 09:45 PM   #11
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can try these they make a set for grey and black tanks http://www.miracleprobes.com/
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Old 05-14-2012, 09:49 PM   #12
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Awesome! There are in my neck of the woods too! Thanks!
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Old 05-15-2012, 06:25 AM   #13
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Has anyone actually used the Horst probes, and if so would you recommend?
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Old 05-15-2012, 07:03 AM   #14
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I thought with the tank wash system mine might read better...wrong...tank is empty, gauge reads 2/3. When it gets full it reads full but most times even after using the tank wash it still reads 2/3... we had the same problem on our Gulfstream...just learn to live with it.
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Old 05-15-2012, 07:32 AM   #15
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Camco makes a wand with a spinning head that attaches to a garden hose it creates a high pressure and blows all the poop and paper off the walls with a spinning brass tip, best $20-25 dollars you can spend, works like a charm!!!
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Old 05-15-2012, 10:36 AM   #16
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Quote:
Originally Posted by Preston View Post
Yours reads 2/3 full right now empty, but when it's full does it read full or just always at 2/3?
The readings are all over the place. Sometimes it works normally, but for the most part it is unreliable at best. Its been quite some time since I had the tank completely full, so I`m not sure if it would read full or not.
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Old 05-15-2012, 11:31 AM   #17
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I was looking at the setup and mind you I'm new to campers with ammenities as i came from a popup with nothing in it. Why can't they design these so that the grey drains through black and act as a wash out?
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Old 05-15-2012, 07:25 PM   #18
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Another thought.. Can you just remove the oem sensors from the tank and clean them off?
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Old 05-15-2012, 07:32 PM   #19
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My trailer is over 9 years old and the black tank sensors still work great. I have a No-Fuss-Flush black tank rinse system. After every dump, I add about 5 oz of Blue Dawn Ultra dish washing liquid. I only dump the black tank when it is over 2/3 full, even if that means leaving "stuff" in the tank for a trip or two. If possible, I dump the tank upon arrival at a park. There is never a line at the dump station on Friday.

The grey tank sensor is unreliable on my trailer. I attribute that to no flush system. Next trailer I'll have a grey tank rinse system installed in addition to the black tank rinse.
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Old 05-15-2012, 10:06 PM   #20
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I have had 3 TT's so far. My current one I bought nes and have a black tank flush installed, and even using the black tank flush all the time my sensors read incorrectly.
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