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Old 07-13-2019, 07:30 AM   #1
Lemmy
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Black Tank showing full when itís not.

Our black tank is reading full even after itís emptied. If the sensor is not reading correctly what is the best solution to remedy this issue? After searching the web I see lots of choices but do not know which one to start with.

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Old 07-13-2019, 07:59 AM   #2
RoadRunnerTR21
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After you dumped the black tank, did you hook up a hose and perform a blank tank flush? Just make sure your blank tank valve is open when you are performing this operation. That might be all you need to do. If that doesn't work, more ideas will be forthcoming.
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Old 07-13-2019, 08:17 AM   #3
rslopez65
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We have never had one that worked and just don't care. Not sure why this seems to be so important. A small bit of TP dried on the sensor may cause a false reading. We know when we need to dump and do so without ever looking at the sensor. Personally, I wouldn't spend a lot of time worrying about it. You will surely get lots of tips on how to get it working again but I doubt you will find any permanent solution.
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Old 07-13-2019, 08:39 AM   #4
jeffba
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When full the toilet will burp when flushing
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Old 07-13-2019, 08:39 AM   #5
AZ Traveler
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Lemmy,

Take some black electricians tape and cover the black tank switch. The read out is totally useless unless you spend way too much time flushing the black tank after dumping it. Just dump your tank every 5-8 days depending on how many people you have in the rig.
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Old 07-13-2019, 09:21 AM   #6
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On the old rig I added outside the tank sensors and they worked great. The only problem was I had already established a dumping schedule to meet our usage and so never used them ever. Big waste of money.
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Old 07-13-2019, 10:48 AM   #7
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We are about to do a tank flush hoping that fix’s the problem - thank you for all the quick responses we really appreciate it. All this can be very overwhelming as a newbie - which brings me to my next question should we keep gray and galley tanks open all the time when hooked up at a site ?
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Old 07-13-2019, 10:57 AM   #8
RoadRunnerTR21
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We leave the bathroom/shower gray tank valve closed and then dump when needed or after a black tank flush. The kitchen gray tank valve is left open while we are at our site. That's what we do but I'm sure you will get different opinions.
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Old 07-13-2019, 11:01 AM   #9
1retired06
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Our black tank sensors have never worked on any of our rigs. Have forgotten they are even there.
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Old 07-13-2019, 11:22 AM   #10
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We shut the grey tank valves a couple of days before we flush the black tank so we have water to wash out the sewer hose.
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Old 07-13-2019, 12:08 PM   #11
carl n susan
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With a washer that drains to the shower tank, I have learned to leave that one open at all times. One never knows when management decides to do several loads of washing. The kitchen is open all the time as well. I ensure there is a loop on the sewer hose which acts as a P trap thereby blocking gasses and insects.

I flush the black tank until it runs clear after every dump. That also cleans the sewer hose.
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Old 07-13-2019, 12:32 PM   #12
Montajmahal
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Quote:
Originally Posted by DQDick View Post
We shut the grey tank valves a couple of days before we flush the black tank so we have water to wash out the sewer hose.
Exactly.

Also, what Carl N Susan said - if you have a washer definitely leave that tank valve open!
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Old 07-13-2019, 02:08 PM   #13
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Yes we do have a washer so we have been making sure to keep it open while doing laundry . Thanks again for all the answers really helps to know we aren’t alone ��
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Old 07-13-2019, 02:43 PM   #14
WeBeFulltime
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Quote:
Originally Posted by 1retired06 View Post
Our black tank sensors have never worked on any of our rigs. Have forgotten they are even there.
Same here. We are full time and never even look at them.
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Old 07-13-2019, 05:18 PM   #15
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Mark-- the tank sensors on all of the tanks except for possibly the fresh water tank are useless. Ours worked only the first week we had the new unit. They get TP on them and other items on the black tank and soap scum and etc on the gray tank probes and always give you a false reading. We keep our tanks all closed but have a routine of dumping the black tank and the grays about every 4 days or so. This makes sure the black tank's not building up and we use PLENTY of water when flushing the toilet also. We use a tank additive by the name of Happy Camper and it breaks down all that is in the black tank. While dumping the black tank I run the internal flush and when I think the tank is empty, I close the black tank valve and run the flush for about 5 minutes then open the valve again and empty the tank. I also have an external flush that I connect to the end of the sewer pipe that back flushes the tank again. Once that is done I close the black tank, open the galley gray, drain it, close that valve and open the shower gray and that cleans out the line and the sewer hose of any debri that might be in it. Close the shower gray and I'm done except for adding the additive down the toilet and dumping about 4-5 bowlfuls of water down into the black tank to make sure the black tank has some water in it and does not dry out.
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Old 07-13-2019, 10:51 PM   #16
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Quote:
Originally Posted by carl n susan View Post
With a washer that drains to the shower tank, I have learned to leave that one open at all times. One never knows when management decides to do several loads of washing. The kitchen is open all the time as well. I ensure there is a loop on the sewer hose which acts as a P trap thereby blocking gasses and insects.

I flush the black tank until it runs clear after every dump. That also cleans the sewer hose.
For some unknown reason the washer drains into the black tank of the 1/2 bath. Cannot leave that one open! I'm sure they have a reason. The only thing I can think of it is the closest other than the bathroom gray.
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Old 07-14-2019, 06:26 AM   #17
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On the last 5er I installed the Garnet SeeLevel external sensors that work great. They are not cheap. On this 5er I had to pull the belly cover for other reasons so decided to install the Horst (now Valterra) Miracle Probes. Oh well, $40 wasted bucks didn't hurt too bad. They are a little better but still virtually useless regarless of hype.


The best 'sensor' is your personal experience and knowing how long it takes to fill a tank, black or gray along with the occasional back flush with a hose end flusher - Camco or Valterra, which, IMO, is hands down better then the built in sprayer that kinda almost works.
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Old 07-14-2019, 09:09 AM   #18
richfaa
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6 rv's and never had gauges that worked. We normally leave the grey and galley tanks open and always keep the black tank valve closed when at a full hook up site which we usually are.Dump the black tank and flush often.We dump every 3 or 4 days. We do not wait for that gross burp or let the black tank or for that matter any tank fill to capacity.
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Old 07-16-2019, 05:45 AM   #19
mazboy
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They ALL show full after awhile. Just learn how to decide when to dump.


We can go several weeks for the two of us without any issues.


Or you can spend more money and have another more expensive sensor installed.
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