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Old 09-19-2017, 07:52 AM   #1
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Black tank level/sensors

Anyone have any issues with blank tank gauges or not completely dumping?

Mine is showing full all the time and I always dump with several days of liquid in it 2/3 full. I notice when dumping it doesn't seem to dump with the same velocity as the grey tank.

On our last trip I ran tank flush sprayers for an hour and still shows full.

Any ideas here? I used ice cubes etc.... no luck.
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Old 09-19-2017, 07:57 AM   #2
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"Shows full" probably because the sensors get wet. Let them dry and it probably (??) might go down. Mine is showing 2/3 right now and I haven't used it in 2 weeks, and I'm guessing it has about 2 gallons in it.

Drains slow......yeah, I hate that. But it's more 'solid' than the gray, so..............
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Old 09-19-2017, 08:11 AM   #3
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Originally Posted by BandJCarm View Post
"Shows full" probably because the sensors get wet. Let them dry and it probably (??) might go down. Mine is showing 2/3 right now and I haven't used it in 2 weeks, and I'm guessing it has about 2 gallons in it.

Drains slow......yeah, I hate that. But it's more 'solid' than the gray, so..............
Don't think it is wet sensors as it was emptied and sat parked in storage for a month and still showed full when we got it out to hit the road.
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Old 09-19-2017, 08:21 AM   #4
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Don't rely too heavily on the accuracy of the sensors.

In ALL the R/V forums I've frequented over the years, this topic of concern is likely at the top. The factory sensors are worthless and only installed so the manufacturers can say there is 'some' kind of monitoring system.

Are there better products on the market? Sure but they cost a few bucks and manufacturers aren't going to spend the money.

As for the tank not dumping correctly... I've read more than one post saying the tank cut-out plug (for the sewer pipe connection) had dropped into the tank on assembly and then migrated itself across the drain hole. Maybe something like this has occurred on yours? Have you tried snaking the sewer line to see if there is any sort of blockage?
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Old 09-24-2017, 07:46 PM   #5
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I had the same problem. Turned out the tank sensor was shorting against the steel bracket that holds up the driver side end of the black tank. I noticed this while I had the drivers side water bay white board removed for another project. The fix was to add a few layers of duct tape over the end of the metal bracket where the wire was shorting against it. I bet that it would be possible to just remove the 4 screws attaching the white board to the coach, and lowering the board down a few inches, to gain access to the short locations, else you will have to reach behind the panel and unscrew all of the hoses leading to the back of the panel. It is not as bad as it seems. Use a mirror to make sure you find them all.

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Old 09-24-2017, 08:27 PM   #6
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I've cleared mine in the past by adding ridex then filling the tank and let sit for as long as you can ( couple days to a week). Then dump. Paper builds up on the sensors.
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Old 09-25-2017, 07:10 AM   #7
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Originally Posted by billpherigo View Post
I had the same problem. Turned out the tank sensor was shorting against the steel bracket that holds up the driver side end of the black tank. I noticed this while I had the drivers side water bay white board removed for another project. The fix was to add a few layers of duct tape over the end of the metal bracket where the wire was shorting against it. I bet that it would be possible to just remove the 4 screws attaching the white board to the coach, and lowering the board down a few inches, to gain access to the short locations, else you will have to reach behind the panel and unscrew all of the hoses leading to the back of the panel. It is not as bad as it seems. Use a mirror to make sure you find them all.

Bill
Do you have a picture of where you applied the tape and how did you determine a wire was shorting? Was there damage to the insulation?

I am going to take a look at this today, heading to Disney in a week and would like to get this working correctly.

Thanks
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Old 09-25-2017, 12:21 PM   #8
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Well doesn't appear to be wires. I took that all apart and they are in good shape and not contacting any of the supporting brackets or any other metals in the wet bay.

Is there a chemical/enzyme treatment that is most effective at digesting/liquefying waste and tissue?

We have been using mainly the dissolvable tst packets but have read good things about the thetford chemdri
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Old 09-25-2017, 12:31 PM   #9
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Originally Posted by psw757 View Post
Well doesn't appear to be wires. I took that all apart and they are in good shape and not contacting any of the supporting brackets or any other metals in the wet bay.

Is there a chemical/enzyme treatment that is most effective at digesting/liquefying waste and tissue?

We have been using mainly the dissolvable tst packets but have read good things about the thetford chemdri
Ever since we switched to SEA-Zyme our black tank is more accurate. The enzyme really breaks down the TP - and this is what usually gets on your sensors giving you inaccurate level readings.

We get ours from Gary & Linda - fellow FROGS & FROG rally vendors:

gnlrvspecialties.com

Having said that, the only sure cure for tank accuracy would be to switch to a external monitor - most who do switch to a seelevel system.

https://www.garnetinstruments.com/rv-shop/
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Old 09-25-2017, 12:40 PM   #10
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Originally Posted by psw757 View Post

On our last trip I ran tank flush sprayers for an hour and still shows full.
How are you using your black tank flush? A lot of folks are under the misapprehension that you hook up the water to the tank flush, open the valve and run the flush for X minutes.

This will not give you a very good result. Running a tank flush is a art form of sorts because what you need to do is CLOSE the valve and let the tank flush spray head fill your tank.

This is where the 'art' comes in -you need to have a VERY good idea of how fast your tank flush will fill your tank. Until you do, I would never run a black tank flush more than 5 min!

After a while you will get it down to a fairly precise science. For example, I know that at 50PSI it takes roughly 11 min to fill our black tank

Fill & dump your tank 2 or so times should clean most of the stuff out. If you read my previous post about SEA-Zyme, and start using that you will find it almost unnecessary to rinse out your black tank once the bacteria/enzyme colony is established. We dump every 2 weeks and those little creatures darn near liquefy everything in our black tank by the time we dump!
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