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Old 08-26-2017, 07:01 AM   #1
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Black tank level sensor

We dumped the black tank, but the level indicator still reads 2/3 full. We can flush the toilet and water drains out with no solids.Any suggestions
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Old 08-26-2017, 07:20 AM   #2
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Lightbulb

This is apparently a common occurrence with most self contained RV's. When you empty the black water tank, do the flush with water as recommended by the manufacturer, then (after draining that "flush" water and debris from the black water tank, put a few gallons of clean water into that tank via the flush inlet. That small amount of water sloshing around as you travel after tearing down may very well clean the sensors inside the tank.

I am wondering if emptying a gallon of dish soap water would help as well, or if that would leave a soap scum/film inside the tank and on the sensors. Have not done that yet... just used water and a couple of ounces of the enzyme stuff.
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Old 08-26-2017, 07:24 AM   #3
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Not unusual IMO. Clean the tank well by filling as full as possible, then drain with clean water. You may even fill, let sit a bit and drain. Do it several times. You may want to fill it about 3/4 full, drive around and then dump and fill and dump. Probably tissue or other material on that sensor. There is also a device that connects to your black tank discharge, it is calledCamco 39062 Dual Flush Pro Holding Tank Rinser with Gate Valve where you can actually hook your non potable water hose and back flush. Water is your friend with waste tanks and lots of it.
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Old 08-26-2017, 07:27 AM   #4
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Get used to it! We've owned 12 RV's and we've yet to have a black tank sensor work correctly after a few trips, even on 3 class A diesel pushers. I understand there are upgraded "level monitoring systems" that do work better than the factory systems but we've never felt the need to change.
My best advise is to pay attention to the way your toilet flushes. If you get a bubble or "burp", time to dump the black tank. No big deal, after a few trips you will get a feel for how long you can go without dumping.
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Old 08-26-2017, 07:34 AM   #5
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This a 2018 384qbok and this is only the second time we have dumped going to try plenty of water thanks for the advise also going to look to see if it has a tank rinser.
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Old 08-26-2017, 07:46 AM   #6
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A tank rince system is definitely a PLUS. However, even thought I rinse our black tank for at least 15-20 min's after each flush, the monitor still shows 1/3 to 2/3 full. I do get peace of mind though as I know the tank is relatively clean when the rinse water runs clear as it flows through my clear elbow on the end of my dump hose.
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Old 08-26-2017, 01:50 PM   #7
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Thanks guys filled the tank up three times and flushed everythig out level indicator back to empty
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Old 08-26-2017, 01:57 PM   #8
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Glad you got it working.
For the future cleanings check this site for information on the GEO Method. Dawn dishwashing detergent and Calgon. Sounds like that has worked for some.
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Old 08-26-2017, 02:03 PM   #9
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Mine is as empty as my brain right now.........and reads 2/3 full.

Sensors get wet, I guess, and stay wet. Or something.

Should be a better way, but there ain't.
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Old 08-26-2017, 02:04 PM   #10
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It's a common sensor problem!

It's a common problem you are having, even in brand new RVs. Often the sensor which is in the tank is simply wet and may take time to dry out! The best way to be certain is to turn off your water (and pump if on), take a flashlight, shine it into your toilet, and see if is full or not! If you can't do that, then there are better sensors you can install or have installed! Also, if your RV sits for long periods of time and you don't flush the toilet to keep it functioning right, the sensors might be very dirty and muck has hardened on them! When ours is in outside storage, we check on it a lot, run the engine, generator, a/c, heat, appliances on generator power, tires, look for critters in mouse traps (so far so good), run the water, and check all the closets! Words of caution! Don't let your Fresh, Black, or Green (joke) tanks sit empty! They can crack! We've learned this from other more experienced RVers! Before our FR, 2 years now and 2 Coast to Coast and back trips, we've tented in the USA and Germany, had an Apache Pop up taken all over the USA then donated to homeless after Andrew ravaged S FL, two VW Campers, and more! My German wife grew up camping with her parents every year in Italy! Our 2 adult daughters grew up camping! Same with our grandkids! Now it's RV time and we love it from our home base station! Dan & Gerda
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