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Old 09-29-2016, 08:07 AM   #1
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Stationary camper

I've got my 34RSBS parked as I am living in it full time while working on a nuclear power plant in Georgia. My black water holding tank is giving me fictitious readings. I drained it yesterday when I saw three dots. (Got not much more than a trickle.) Afterwards I checked and saw four dots. I do have the flush system and use it every time I drain. Can anyone shed some light on how to either clean the sensors on a stationary set-up or replacing the sensors. Thank you in advance for your comments.

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Old 09-29-2016, 08:11 AM   #2
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Usually the issue a bit of tissue. Sometimes particles get caught on the sensors and show a false reading. Do you have a black tank flush system on your unit? Usually they are pretty good at cleaning "particles" off of the sensors. A "wand" flusher that you stick down the commode hole works pretty good as well.

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Old 09-29-2016, 08:13 AM   #3
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Misleading or wrong black tank sensors?

Welcome to the wonderful world of operating an RV.

There are float-type sensors that will give you a much more accurate reading, until a piece of tp sticks to it....

I've found that generally keeping tabs on usage is good enough. Dump before you know it is full.
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Old 09-29-2016, 08:40 AM   #4
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Common problem with all rv's.

I always add water after I dump the tank, add soapy water from the dishpan to the toilet also, have tried all kinds of things. Also use black tank flush regularly.

Still the gauges tend to misread from time to time on both of my trailers.
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Old 09-29-2016, 08:44 AM   #5
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Just go by sound and you know when it is full. Or look down the hole when it is past the floor you have to dump it. No dumping station near, be sure you have a portable tank ready.
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Old 09-29-2016, 10:03 AM   #6
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How do you dump the tanks when stationary?

SeeLevel sensors are very pricy but get good reviews. Most every rv'er has to deal with this problem whether stationary or in motion.

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Old 09-29-2016, 10:13 AM   #7
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I find that the Grey tank fills faster. From showers and doing dishes.
I just dump both when the Grey gets close to full.

Also, try holding the button for a bit longer.
Seems like the false reading will clear after 5 seconds or so. Sometimes.
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Old 09-29-2016, 11:44 AM   #8
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What everyone else said... Dirty sensors are a common problem.

I'd add that by adding a clear, short extension in your sewer system you can see what is being flushed out of your black tank. You may need to flush longer than you are. Even so, you may not (if ever) get the sensors clean enough to work as well as you'd like.

If you have a straight view down into the tank, shutting off the water and holding the toilet dump valve open will let you see down into the tank... shut off all exhaust fans first! .

If you haven't been, you also need to add water to the black tank after you dump to be sure 'stuff' is not building a 'tower of terror' on the bottom of your tank.

This summer we stayed in one place for 3 months as campground hosts. That was a first for us. We had to do two things differently because of staying on one spot:
1). Run the black tank flush longer (several times for ~30 seconds or so) than we did when we were traveling frequently.
2). For #1s, DW put her toilet paper in a trash bag. I don't know if this is necessary, but she was willing and it seemed to help.

Even with the above, our sensors don't read like new, but I know we are not building up residue in the tank that will be difficult to remove.
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Old 09-29-2016, 12:36 PM   #9
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Common issue. First after dumping add lots of water back into the tank.

Next to see how full the black tank is, flush and look down the hole
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Old 09-30-2016, 07:26 AM   #10
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I've been pretty lucky in that my BWT sensor has been accurate so far. After dumping, I always add a BWT tank agent and put at least 3 to 4 full toilet bowls of water down there. Against Jayco's recommendation, after dumping, I'll also run the flush with the valve closed for a few minutes partially filling the tank, then dump. I repeat this a few times.
I also never dump a partially full tank. I always wait until its full. I'll top it off by running the toilet if necessary if I want to dump.

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