Thread Tools Display Modes
Old 06-03-2013, 06:52 PM   #1
Senior Member
Join Date: Feb 2013
Location: Southern Indiana
Posts: 119
Tank level guages

Anyone out there have an answer for incorrect holding tank levels on the control panel? The grey and black water tanks are both giving false readings. I can completely empty them both, and they will still show at least 1/3 full. Sometimes 2/3 full. I can flush out the black water tank and sometimes it will go as low as 1/3 still full, but never any lower. They were both showing empty when we took our RV down to our leased lot and set it up. Seems like they have never worked right since then. The regular water tank shows correctly. I have twice last weekend drained the black water tank into the 27 gallon portable holding tank we have to haul to the dump station. Both times the reading was 2/3 full. After emptying twice, the 27 gallon portable tank is only about 2/3 full. We keep the chemicals in the tank as directed. Any ideas?

RickyD929 is offline   Reply With Quote
Old 06-03-2013, 07:01 PM   #2
Fulltime family RVer
ependydad's Avatar
Join Date: Nov 2011
Posts: 16,628
The tank gauges are notorious for being wrong. Some people swap then out with Horst Miracle Probes (if you search the forum for this- Herk did some posts on their installation).

I find that to have accurate readings, I have to *flush* my black tank after dumping it. But, I also have sewer hookups and am not hoofing the black water via totes. I usually run the flush 3 times with 6 minutes of water and dump after each re-filling.

Though, I've personally have never had issues with the gray. But the same Herk mentioned above has.

2012 Ram 3500 DRW/crew cab/long bed/4x4/4.10 gears pulling a 2017 Spartan 1245 by Prime Time
Checkout my site for RVing tips, tricks, and info | My family and I have fulltimed since June 2015
ependydad is online now   Reply With Quote
Old 06-03-2013, 07:10 PM   #3
Senior Member
bubbles's Avatar
Join Date: Dec 2012
Posts: 2,967
My indices do not read empty until sometime after emptied. I believe it's due to residual moisture in what ever tank this happens. Eventually though the indicator does show empty.
bubbles is offline   Reply With Quote
Old 06-03-2013, 07:36 PM   #4
Senior Member
Join Date: Feb 2013
Location: Southern Indiana
Posts: 119
Tank Level Gauges

I have noticed that they will sometimes drop to the next lower level after a period of time. But since both the gray and black tanks are used regularly when we are staying in it, it does not really have time to stay completely empty long enough to tell if it would go all the way back to empty. I always empty both tanks before leaving on Sunday. We will leave the gray tank completely empty, with it still showing either 1/3 or 2/3 still full. The black tank I will empty, and then only run a gallon or so of water into the tank so that I can add the chemicals. Upon returning the next Fri., neither one will be showing empty. They will still be either 1/3 or 2/3 full on the gauge. Even though I know they are neither one near the levels they are showing, I hate to just ignore the readings because of the big IF
RickyD929 is offline   Reply With Quote
Old 06-03-2013, 07:55 PM   #5
Senior Member
Join Date: Nov 2012
Location: X
Posts: 2,781
There is another alternative to those "miracles". You should consider capacitive tank-level sensing. See this: or this: NUWA is/was using the second of these and I was very impressed. The first is available from Camping World.
BarryD0706 is offline   Reply With Quote
Old 06-03-2013, 08:09 PM   #6
Moderator Emeritus
Dave_Monica's Avatar
Join Date: Sep 2007
Location: Ontario, Canada
Posts: 4,329
After you've camped with it for a while, you'll soon figure out the number of days under normal usage before the tanks are full. It's easy to verify the level in the black tank by looking down the toilet with a flashlight as it empties directly into the tank. The gray tank when full will have standing water in the shower base.

If you search the forum for GEO Method, it will keep the tanks cleaner and the sensors reading more arrucately.



Nights camped in 2013 - 55, 2014 - 105, 2015 - 63
Dave_Monica is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Featured Campgrounds

Reviews provided by is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 06:07 PM.