Jayco RV Owners Forum
 


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 06-29-2020, 02:10 PM   #1
Member
 
Join Date: Jul 2018
Location: Indianapolis
Posts: 38
Black water tank always shows 3/4 full

Black water tank always shows 3/4 full. We have a one-year-old white hawk which we have only used four or five times. We are always careful about dumping dishwater down the toilet and run lots of liquid through the toilet but we noticed that the indicator lights always show 3/4 full. Any suggestions for how to solve this problem?
__________________

CaptainVideo is offline   Reply With Quote
Old 06-29-2020, 02:23 PM   #2
Senior Member
 
Colorado's Avatar
 
Join Date: May 2018
Location: Colorado
Posts: 523
A lot of people have the same issues with the sensors, you’re not alone. If your camper was sitting for a long time there may be dried material on the sensors, that’s what happened to ours. I filled the tank until the full sensor JUST started to register the water, plenty of Dawn and several drop ins. I let it sit for several days then a LONG DRIVE through town to get the solution to slosh inside the tank. I did the same with the grey tank. The following is the routine I do now...

There’s probably tissue residue on the sensors. I add 5-10 gallons of water, 1 cup Dawn dish soap and a Commando drop in to the black tank after It’s been empty. I plan ahead when it’s time to dump the tank, I fill it FULL with a hose and go for a drive around town...lots of turns, stopping and starts THEN I dump. It’s been working great so far.
__________________

__________________
VENI VIDI VICI
Colorado is offline   Reply With Quote
Old 06-29-2020, 02:51 PM   #3
Senior Member
 
Jagiven's Avatar
 
Join Date: May 2012
Location: Minnesota
Posts: 6,186
The problem is the sensor design. Basically it is a nail that stick maybe 3/4 of an inch into the tank. Guess what, that sensor probe collects "stuff" on it, and completes the circuit. Generally speaking, most people just use a flashlight and looks down the toilet to get an idea how full the tank is. This is a good practice to make sure you have enough water in the tank.

You can replace the sensors. There is one that is similar to the existing sensor, but they have a little cap over them so stuff does not build up directly on the probe (sorry forgot the name). Then there is another that is called Sea Gauge, that uses a different technology and are very accurate, and tend not to give false readings.

I tend to just live with it. But when the gauges start getting flaky I may add about a cup of liquid fabric softener (can use water softener crystals too) to about 4 gallons of water, and dump about half into each tank after dumping. I also add a few more gallons of water to the black tank. The softener changes the surface tension of the water, so it can penetrate into the stuff, and loosen it up. The sloshing motion while driving washes the walls down.

You should test your TP, to make sure it is RV suitable. Take one or two clean sheets. place them in a small jar with some water. I do not recall the times anymore. But lightly shake it up for a few seconds, and let it sit for 30 minutes. After 30 minutes, the paper should be dissolve in the water. If it looks anything like TP, find a different brand.

After you dump, always fill the Black tank with clear water, about 10% of the tanks volume. So if you have a 40 gallon black tank, put in 4 gallons of water back in right away. Never leave the tank dry unless it is for winter storage. Water, and lots of it, is your friend.
Jagiven is online now   Reply With Quote
Old 06-29-2020, 04:01 PM   #4
crl
Member
 
Join Date: Jun 2019
Location: Longview
Posts: 56
We too have a White Hawk and the black water tank almost always reads 3/4. I am extremely diligent in clean outs after each trip. If the dump station line allow I will flush with my black water flush and the fill till sensor says full two to three times. When I get finished my sensor will read empty. Buy the time I get back on it is reading 3/4 again. We have tried all the published remedies and nothing has seem to help.

I finally stopped stressing about it. If my DW and I don’t have sewer hook ups, we can go at least 5 days with room to spare. If you find a magic pill that fixes the problem let us know. As said, we have learned to manage without it.

Good Luck!
crl is offline   Reply With Quote
Old 06-29-2020, 04:07 PM   #5
Member
 
Join Date: Jul 2018
Location: Indianapolis
Posts: 38
Thanks. We learned a LOT from your post & have our homework.
CaptainVideo is offline   Reply With Quote
Old 06-29-2020, 08:15 PM   #6
Senior Member
 
Join Date: Dec 2012
Location: Southern Indiana
Posts: 2,551
Try this. It's worked for me for 5 years now. Use the liquid Calgon instead of the powdered.
https://uniquecampingmarine.com/blog...the-geo-method
__________________
2012 Eagle 320 RLDS
2017 Ford F-250 FX4 Crew STX 6.2l
3.73 E-locker
TCNashville is offline   Reply With Quote
Old 06-29-2020, 08:31 PM   #7
Senior Member
 
Join Date: Jul 2017
Location: Tucson
Posts: 504
Our trailer always does this. The solution is the black tank cleaning feature (if your trailer has this). After spraying it down it always reads correctly, but I must do this on every camping trip or it will read 3/4 full on the next trip even though I know its empty.
__________________
2018 Dodge RAM 2500 / Cummins 6.7 Turbo Diesel
2018 White Hawk 28RL
Scott_Trailer_Newbe is offline   Reply With Quote
Old 06-30-2020, 01:39 PM   #8
Senior Member
 
cekkk's Avatar
 
Join Date: Nov 2010
Location: Pahrump
Posts: 3,364
Not to worry. I think the only subject that rivals this one would be will my F-150 pull my 36' TT. There are many suggestions on how to deal with the black water thanking what's in Decatur, but as far as I'm concerned the best solution is a flashlight and a quick look down the toilet into the tank. it will never appear full when it's empty nor will it appear empty when it is full.
__________________
'11 Eagle 320RLDS
'02 F350 PSD Dually 4WD
DW's Ride, '13 Expedition
'14 Denali XL
cekkk is offline   Reply With Quote
Old 06-30-2020, 03:19 PM   #9
Senior Member
 
RetiredOne's Avatar
 
Join Date: Apr 2019
Location: Ocean County
Posts: 2,311
My black tank sensors started to act up, so when I came home this past weekend, after I dumped in the campground, I used my black tank flush to fill the tank like 3/4 of the way, added PineSol and Dawn, and let it swish around on the ride home.

When I got home, I hooked up my drain line to the sewer cleanout, and drained it all... Now, my sensor reads empty.
__________________
----------------

2019 Redhawk 24B

RetiredOne is offline   Reply With Quote
Old 06-30-2020, 09:29 PM   #10
Senior Member
 
Join Date: May 2016
Location: Milpitas
Posts: 984
We have a 2017 Whitehawk. We've tried most of the above suggestions, sometimes they work, sometimes they don't. Calgon and Dawn seem to work the best for us but the one thing that does work every time is when we move from one campground to the next; we fill about 1/3 full and let the water swish around on the drive. When we arrive we dump the black tank as soon as we are level. I don't remember the OP of this method but he nicknamed it the "sloshinator"! Frankly, after 3 years of camping we always have an idea of when the tank is getting full and use a flashlight to check.
__________________
X2019 Chevy express 2500 Van Coversion. 2017 Jayco 23MRB: 26' total and Glacier Package. 2 Renogy solar panels. Married 45 years. Aki the "mutt," 13 years old "Excited to learn new things everyday and humbled by those who offer to help."
travelingjw is offline   Reply With Quote
Old 07-01-2020, 01:53 AM   #11
Senior Member
 
Cavie's Avatar
 
Join Date: Apr 2020
Location: Port Charlotte FL/Hinsdale MA.
Posts: 407
When the toilet burps flush the tank.
__________________
Retired Master Electrician and Building Inspector.

2011 Keystone Sprinter 323 BH
Cavie is offline   Reply With Quote
Old 07-01-2020, 03:23 AM   #12
Junior Member
 
Join Date: Jun 2020
Location: Okc
Posts: 6
I googled Sea gauge and couldn’t find anything. I did find one called See level, is that the one you are referring to? The See level looks like a good system. We have the same problem with our tanks as well, I saw a video where a guy put a couple bags of ice in his tank and drove around.
Rambling Drabek’s is offline   Reply With Quote
Old 07-01-2020, 05:01 AM   #13
Site Team
 
norty1's Avatar
 
Join Date: Jan 2011
Location: Charleston, SC
Posts: 17,179
Quote:
Originally Posted by Rambling Drabek’s View Post
I googled Sea gauge and couldn’t find anything. I did find one called See level, is that the one you are referring to?
Here is the link if anyone wants to look! https://www.garnetinstruments.com/rv-shop/
__________________
Moderator
2011 351RLTS Eagle, Mor/Ryde suspension & pin box, Hughes PWD50 Power Watchdog
06 F350 Lariat PSD SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS
2017 GMC Terrain (future TOAD)

Can't find what you're looking on JOF? Try:Jayco Owners Forum Custom Google Search
norty1 is offline   Reply With Quote
Old 07-01-2020, 06:58 AM   #14
Senior Member
 
RAurand's Avatar
 
Join Date: Dec 2015
Location: Pennsylvania
Posts: 1,533
Some folks use these. Just make sure you mount them correctly!

https://www.etrailer.com/RV-Sewer/Va.../T21301VP.html
__________________

2012 Ford Expedition EL
2016 28BHBE, Elite and Thermal Packages.
Equal-i-zer 4-point Sway Control, Southwire 34930 Surge Guard 30A, Tire Minder TPMS A1A
(2) Yamaha EF2000iS Generators, Micro-Air EasyStart™ 364 (3-ton) Soft Start, GoodYear Endurance ST225/75-15 Load Range E
RAurand is offline   Reply With Quote
Old 07-01-2020, 12:48 PM   #15
Member
 
Join Date: Aug 2019
Location: Flagstaff
Posts: 65
We just don't pay any attention to ours. Gray fills first anyway.
It has nothing to do with what's left in the tank or the TP we use. (Charmin ultra soft is fine btw)
One flush it can be on E, the next flush 2/3. Our sensors must be right next to the toilet.
A couple times I verified it was empty after dumping because of the sensor. Now I don't worry about it.
__________________

Fulltime Boondockers
2019 RAM Big Horn 1500 5.7 Hemi
2020 Jayflight SLX8 245RL Rocky mountain/ Baja
600w solar (+100 portable), 450 ah bank
m2bandit is offline   Reply With Quote
Old 07-01-2020, 01:57 PM   #16
Senior Member
 
Join Date: Oct 2015
Location: Worcester
Posts: 1,413
My BT meter is still accurate on my 2016.. I do dump, flush, fill, dump.. seems to work.. I'm connected to sewerage at my site so it's easy for me to do..
__________________
2016 Jay Flight 38FDDS
jloco is offline   Reply With Quote
Old 07-08-2020, 12:56 PM   #17
Senior Member
 
Join Date: Sep 2014
Location: San Marcos
Posts: 180
Quote:
Originally Posted by CaptainVideo View Post
Black water tank always shows 3/4 full. We have a one-year-old white hawk which we have only used four or five times. We are always careful about dumping dishwater down the toilet and run lots of liquid through the toilet but we noticed that the indicator lights always show 3/4 full. Any suggestions for how to solve this problem?
The only surefire way is to buy an RV tank cleaning wand. I use the Camco RV Flexible Swivel Stik. Dump the tank, squirt some Dawn or LA Awesome in there, then run the Stik down a few inches and turn it on full. Let it run for 10 minutes then squirt some more cleaner in and again run for 10 minutes. That should do it. Use the Stik every time you dump the tank, for about 2 minutes, to prevent future problems.
Marmot is offline   Reply With Quote
Old 07-08-2020, 01:08 PM   #18
Senior Member
 
Hollander Mutthaulers's Avatar
 
Join Date: Sep 2016
Location: West Michigan
Posts: 182
Inaccurate gauges don't bother us any more. You just kind of get a feeling. The worst part is knowing that in yet one more way Jayco - and others - has put in a feature that they know doesn't really work. Why do something when you know it just plain doesn't do any good? Perhaps sometime I'll be curious enough about Valterra miracle probes to give them a try. And that's the positive about RVs - they are made just crappy enough to allow and encourage owners to customize them and make them "better than new" and that's half the fun.
Hollander Mutthaulers is offline   Reply With Quote
Old 07-08-2020, 01:20 PM   #19
Site Team
 
JFlightRisk's Avatar
 
Join Date: Apr 2012
Location: Newark, NY
Posts: 5,782
We flush the black with a wand every time also, and those are still working after 8 years. The gray tank's been stuck on 1/3 for the first time ever, this summer. So I ordered the Horst sensors for the gray tank. They arrived yesterday, went out to check the level before I crawled underneath with the new ones. You guessed it...shows empty! Go figure!
__________________
Every day's a learning experience, though sometimes not what we expected.

2012 Jay Flight 19RD
2016 Ford F150 XLT 2X4 SC 3.5L Eco Max Tow
2010 Tundra TRD DBL Cab (Traded)
1 Spoiled Dog
JFlightRisk is online now   Reply With Quote
Old 07-08-2020, 02:05 PM   #20
Member
 
Join Date: Jul 2018
Location: Indianapolis
Posts: 38
Dawn instead of Palmolive

Is there a reason everyone suggests Dawn, which I don’t have, instead of Palmolive which I do have?
__________________

CaptainVideo is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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

Powered by vBadvanced CMPS v3.2.3
Disclaimer:

This website is not affiliated with or endorsed by Jayco, Inc. or any of its affiliates. This is an independent, unofficial site.


All times are GMT -6. The time now is 11:03 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Copyright 2002-2016 Social Knowledge, LLC All Rights Reserved.
×