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Old 06-05-2019, 10:14 AM   #1
Hshorten1
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Black tank sensor

Every time I empty black tank, sensor will say 1/4 full instead of empty. When I use black tank flush, I can get it to say empty but it takes a lot of time and a lot of water. Then, the first time I have to empty the black tank again, the lights say 1/4 instead of empty. Has anyone else had this problem?
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Old 06-05-2019, 10:30 AM   #2
JRTJH
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Virtually everyone on the forum who has black tank sensors (and dares push the select button on the monitor)..... It's a common problem, one that 95%+ simply ignore. If you really REALLY want to fight the gremlins, you're in for hours and hours of frustration. Most just ignore the monitor/status indicator and rely on sound or number of days since last dump..... YMMV
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Old 06-05-2019, 11:44 AM   #3
Hshorten1
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Thank you. Sounds good to me.
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Old 06-05-2019, 11:30 PM   #4
Kanadakid
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John

When you say sound, what do you mean ? New to this and not sure my black tank lights are working correctly either. Don
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Old 06-06-2019, 03:31 AM   #5
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Quote:
Originally Posted by Kanadakid View Post
When you say sound, what do you mean?
I think it's similar to when you fill your gas tank. As it gets toward the top, you can usually hear it before the gas pump shuts off on its own. Of course if you ignore it and try to keep pumping, it overflows and makes a mess. Same thing with your black tank.



[EDIT] That being said, we usually go by days per dump. Never had problem with three days weekends for two people on a 30 gallon black tank. If we stay some place for a week without full hookup, I will pull up stakes and dump mid-week since we don't have a portable honey wagon.
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Old 06-06-2019, 05:12 AM   #6
Logan X
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Your sensor reads 1/4 full, you are lucky! My sensor always reads 100% full.
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Old 06-06-2019, 05:33 AM   #7
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Originally Posted by Kanadakid View Post
John

When you say sound, what do you mean ? New to this and not sure my black tank lights are working correctly either. Don
As rjrelander said, when the black tank starts getting full, the sound during flushing changes from a "hollow whoosh" to a "muffled swish" (these words used only as an example) and when the black tank gets to "only a couple flushes until full" the rooftop vent stack starts to "gurgle". Our clue is the "muffled swishes" and we usually dump within a day of hearing that sound change. If we hear the "vent stack gurgles" then it's time to cancel plans, tow to the dump station and empty the black tank. When connected to a sewer connection, we keep flushing to the "gurgle" but when dry camping, I try to catch the tank before that level of fill. Our tank gauges haven't worked in at least the last 4 or 5 years. I stopped trying to keep them clean and somewhat accurate long ago.

For us, and I suppose every trailer has its own "personality" on how it communicates during flushing, but for us, the "swishing is our cue" and the "gurgles" are our WARNING !!!!!
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Old 06-06-2019, 07:38 AM   #8
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In 40+ years of rving I've never had any rv that those sensors worked past the 1st or 2nd tank full & not worth the work or aggravation to get them any better. If you're counting on them to indicate when your tanks are full, DON'T! As John said we always went by sound or # of days of use.
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Old 06-06-2019, 08:50 AM   #9
Hshorten1
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Thanks everyone. Sound it is!
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