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Old 11-07-2013, 10:40 AM   #1
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Black Water Tank

I have a National 2005 Seabreeze Model 8311XL

I can not get the water tank level sensor to read correctly. Can anyone help me. I've tried ice, soap, water softener. I've filled and emptied it a dozen times. I would like to know how to find the sensors in the tank in order to replace them.

Ron Hitchcock

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Old 11-07-2013, 10:43 AM   #2
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Mine are accessible through the wet bay.

2006 Phoenix Cruiser 2551
2004 Jeep TJ 4"lift 35" tires 4:56 gears
Mark & Carole Big Bear, Ca. RVM 54
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Old 11-07-2013, 12:18 PM   #3
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Originally Posted by rhitch99 View Post
I have a National 2005 Seabreeze Model 8311XL

I can not get the water tank level sensor to read correctly.
Many of us can't. Or if we can, it's quickly incorrect again from sludge.

Can anyone help me. I've tried ice, soap, water softener. I've filled and emptied it a dozen times. I would like to know how to find the sensors in the tank in order to replace them.
We gave up on the gauges. None of those recommendations worked for us either. We open the commode slider and look down into the tank. We know now, unless one of us gets an upset stomach, that we don't have to dump it for 6 days to 7 days. The graywater varies more depending on how much cooking and eating out we do.
Retired. RVing with one husband and five cats.
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Old 11-07-2013, 12:39 PM   #4
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Old 11-07-2013, 12:49 PM   #5
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Exactly what RanCarr said. I use a flashlight.
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS

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Old 11-07-2013, 12:55 PM   #6
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I replaced our sensor system with a Garnet 707 SeeLevel system. Works like a champ and never have to worry about dirty sensors!! SeeLeveL RV Gauges by Garnet Technologies Inc.
Ronnie (WD5GIC) & Jan (WD5IHU)
2003 Monaco Dynasty Countess 42' w/tag, 2012 Ford Flex

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Old 11-12-2013, 05:02 AM   #7
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Ya this is a common problem and yes there is a cheap solution. My black water tank was reading 2/3 full even when bone dry. I bought every thing known to man even drove up and down a dirt road for an hour to try and get it clean. All to no avail.

I went to Wal-Mart and in the RV section they had two wands. One with a rotating head and one with four holes. The one with the 4 holes was about half the price as the one with the rotating head. Since I have a great deal of Scottish blood I got the $10 with the 4 holes. Hooked it to a hose opened the gate with the unit in the camp ground and after about 20 minutes that little thing had completely cleaned my sensor. I had to use it several more times to remove residual waste but now it works like a dream. So every time I break camp I now run that little wand in there and no more problem.
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Old 11-12-2013, 05:34 AM   #8
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My Wife uses a rubber tub to wash dishes and dumps the used water in the toilet! We travel daily so this keeps our black tank clean and slick. Im not sure if this would work for a rig that doesn't move around much...

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Old 12-01-2013, 10:26 AM   #9
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I dumped a gallon of "Simple Green" in mine and then drone a total of 700 miles to Quartzsite,...cant believe all of the stuff that came out during the next drain. the sensors still read 3/4 full when empty but I bet that the tank is as clean as a whistle.
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Old 12-01-2013, 11:11 AM   #10
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False readings from the standard factory "button" sensors is normal in any RV. If a person doesn't have false readings, that's more the exception. Your button sensors won't be faulty and there's no point in replacing them.

We installed Horst Miracle Probes on our last TT and they worked fantastic. Just pull out the old ones and install the Horst ones. Under $40 for a set. About 15 minutes to do *IF* you have access to the tanks. You can also get them for grey tanks too. Installing any aftermarket sensors will require access. You may want to get a shop to do the install.

The Horst probes were the best $40 (or so) we ever spent on our TT. I bought a set for our new TT but we have an enclosed underbelly and will have to get the dealer to install them.

There's all sorts of things you can try like chemicals, ice, the GEO method, backflush and tank flush wand but for an older or even newer RV that may have some stubborn buildup, you might want to consider using a liquid drain cleaner.

We had major problems with our black tank this past summer and used it and it turned out clean as a whistle in there and no more false readings and it read empty for the first time. If you do this, you will be able to look down into the tank and see if there is anything preventing proper emptying of the tank. I found excess ABS glue hanging down from the flange like stalactites that was not allowing the solids in the tank to fully flush away.

If you use liquid drain cleaner, you MUST use the type that does not attack metal or plastic. And you MUST NOT empty the tank into a septic disposal system otherwise you can completely destroy the leach field. Our factory manual even says to use a liquid drain cleaner if ever needed.

The liquid drain cleaner is relatively cheap and available anywhere. There are some RV specific heavy duty chemicals that some will suggest trying but I know they can be expensive. Also, some of the RV ones will only work in warm temperatures.

You should be adding water to the tank before you do a dump to help flush the contents out. During normal daily use, don't get stingy on the amount of water you use to flush each time. More water is the way to go. We like to use a chemical after each dump but some will say it doesn't help because it can't break down the solids quickly enough, but I'm not so sure about that. You may want to check the type of TP you are using. Some RV brands don't disintegrate like they should and some household brands do and can be used (and are a lot cheaper).

FWIW as a bit of a side note, the typical readout display sometimes will not reflect the actual tank level (if sensors are good). When it reads 2/3 full, it could mean that the level has just reached 2/3. Or it could be just under 100% full. These readouts are almost as useless as the button sensors. If you go to something like a SeaLevel setup, you can get a digital readout.
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Old 01-23-2014, 07:10 AM   #11
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Davinger, do you have a factory installed tank flush system or do you only have the Walmart wand ?

Larry, Alice, and Halle (part-time watch dog)
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tank, water

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