Good Sam Club Open Roads Forum: Tech Issues: Are My Tanks Really Empty?
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 > Are My Tanks Really Empty?

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Hurricaner

Hurricane Utah

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Posted: 09/30/20 03:09am Link  |  Quote  |  Print  |  Notify Moderator

Winnebago uses non contact tank sensors and they're usually pretty accurate. You have a 42 gallon grey tank and it probably takes a lot longer than 20 seconds to empty, more like 2 or 3 minute's. Next time you dump look at the hose and make sure the tank has actually stopped draining. The other possibility that was mentioned earlier is some nut left one of the install cutouts in the tank and it is blocking the drain.

Sam


Sam & Kari
Hurricane, Utah


2019 Winnebago Sightseer 33C

DallasSteve

Texas

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Posted: 10/01/20 09:09pm Link  |  Quote  |  Print  |  Notify Moderator

Hurricaner wrote:

Winnebago uses non contact tank sensors and they're usually pretty accurate. You have a 42 gallon grey tank and it probably takes a lot longer than 20 seconds to empty, more like 2 or 3 minute's. Next time you dump look at the hose and make sure the tank has actually stopped draining. The other possibility that was mentioned earlier is some nut left one of the install cutouts in the tank and it is blocking the drain.

Sam

I can see the gray tank in my storage closet and it has wired sensors on the plastic sides, so those look like contact sensors to me.

I emptied my tanks again today and I timed them. The gray tank was full to the point of standing water in the kitchen sink. They took longer than my guess. The black tank water and solids rushed out for about 15 seconds and continued slower for about another 5 seconds. The gray tank water rushed out for about 30 seconds and continued slower for about another 5 to 10 seconds.

2 or 3 minutes is way more than it ever took to drain the gray tank, even when it was brand new. I still say the 30 seconds seems about the same as it was before when I drained after 2 days, instead of 1.





Katdaddy

Petal, MS USA

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Posted: 10/03/20 04:41pm Link  |  Quote  |  Print  |  Notify Moderator

Sensors will get dirty and not read correctly. To clean, buy some liquid dishwasher detergent. When you leave home add 1 cup of the detergent and a couple gallons hot water to your tank. Dump when you get to campground. Depending on how dirty tanks are, you might have to do this a couple of times. I works great for gray and black tanks.


Little by little, one travels far - J.R.R. Tolkien
There ain't no surer way to find out whether you like people or hate them than to travel with them. - Mark Twain

Hurricaner

Hurricane Utah

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Posted: 10/04/20 01:51am Link  |  Quote  |  Print  |  Notify Moderator

Winnebago has used what they call true level sensors for years unless something has changed in the last year. They are a non contact probe that mounts to the outside of the tank with glue. They are pretty darn reliable on the water and grey tank, the black can get toilet paper on the sides and fool them.
If you are confidant the tank is draining than something is filling it. The best way to determine that is to run off the water tank using the pump. You should be able to here the pump running when it shouldn't be and trace the problem from there.

Sam

Dusty R

Charlotte Michigan 48813

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Posted: 10/04/20 02:30pm Link  |  Quote  |  Print  |  Notify Moderator

Our first mh was a 1988 Mallard, it had tank probes and the monitor always worked.
Our next one was a 2001 Itasca, also with tank probes showing 1/3 levels. To me 1/4 levels would be a lot better. Anyway you could NOT depend the readings. My opinion the Mallard used the full 12 volts a-crossed the probes and the Itasca used a system like an Ome meter, and a film of moister would cause it to give faults readings.
A couple years after getting the '01 Itasca I learned about the SeeLevel system, got one and installed it. It gives readings in % which much better than thirds.
It has circuit boards that you peal and stick to your tanks. They use the original wires but only one.
We bought new 2014 Itasca in 2015, it also had a monitor panel that showed in thirds. I bought another new SeeLevel system and installed it in our new mh.

Dusty

DallasSteve

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Posted: 10/04/20 04:20pm Link  |  Quote  |  Print  |  Notify Moderator

Hurricaner wrote:

Winnebago has used what they call true level sensors for years unless something has changed in the last year. They are a non contact probe that mounts to the outside of the tank with glue. They are pretty darn reliable on the water and grey tank, the black can get toilet paper on the sides and fool them.
If you are confidant the tank is draining than something is filling it. The best way to determine that is to run off the water tank using the pump. You should be able to here the pump running when it shouldn't be and trace the problem from there.

Sam

Winnebago has a lot of different models and maybe the Intent uses something different. I looked again at my black and gray tanks in the storage compartment and they each have about 4 wires connected to something that is screwed into the side of the plastic tank. I could take a photo, but it's not worth the time to me to upload it so I can link it here. If that is "non contact" then you are correct, but to me it looks like the sensors puncture the side of the tank to sense the water level.

Hurricaner

Hurricane Utah

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Posted: 10/05/20 07:08am Link  |  Quote  |  Print  |  Notify Moderator

Quote:

Winnebago has a lot of different models and maybe the Intent uses something different. I looked again at my black and gray tanks in the storage compartment and they each have about 4 wires connected to something that is screwed into the side of the plastic tank. I could take a photo, but it's not worth the time to me to upload it so I can link it here. If that is "non contact" then you are correct, but to me it looks like the sensors puncture the side of the tank to sense the water level.
No, you are correct. I just assumed Winnebago used the non contact on all their motorhomes but what you are describing is definitely the standard tank probes which are notorious for giving false readings. Still 30 seconds is pretty fast for a 42 gallon tank to drain unless you have a 3" drain valve vs a 1 1/2". Again if you are confident the tank is draining I would run off the pump which will give you a clue if something screwy is filling the tank.

Sam

DallasSteve

Texas

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Posted: 10/05/20 09:10am Link  |  Quote  |  Print  |  Notify Moderator

Hurricaner wrote:

Quote:

Winnebago has a lot of different models and maybe the Intent uses something different. I looked again at my black and gray tanks in the storage compartment and they each have about 4 wires connected to something that is screwed into the side of the plastic tank. I could take a photo, but it's not worth the time to me to upload it so I can link it here. If that is "non contact" then you are correct, but to me it looks like the sensors puncture the side of the tank to sense the water level.
No, you are correct. I just assumed Winnebago used the non contact on all their motorhomes but what you are describing is definitely the standard tank probes which are notorious for giving false readings. Still 30 seconds is pretty fast for a 42 gallon tank to drain unless you have a 3" drain valve vs a 1 1/2". Again if you are confident the tank is draining I would run off the pump which will give you a clue if something screwy is filling the tank.

Sam

The pump test sounds like a good idea. Sometime when we are not using much water I will give it a try and listen for the pump.

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