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Old 11-29-2020, 10:10 AM   #1
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Where are the tank sensors?

I have a 2004 Winnebago Journey. The black water tank shows 1/3 full and the gray water tank shows 2/3 after I fully dump the tanks. After our trips and parked at home I pull open the dump valves and leave the cargo door open for a couple days to air out the tanks. When I air out the tanks the sensors both reset to empty. I am thinking it is time replace the sensors.

I have tried numerous methods posted to clean the sensors and I might get the tanks to read empty on a trip once maybe twice then the false readings start.

I have checked the parts diagrams and crawled around underneath and in the cargo bay and I can't find where the sensors are located.

Thanks
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Old 11-29-2020, 10:29 AM   #2
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Sensors are usually on the side of the tank and hard to access. The sensors are know to seldom work after a few months. One brand of sensor that works better than others is the SeeLevel units. Manufacturers do not use then as they cost more.

One good way to clean off the sensors is to put about 1/3 to 1/2 tank of water in both tanks. Give then a very liberal dose of cheap dishwasher powder soap. Take the unit for about a 30 minute drive and slosh then good. Then go and immediately dump both tanks and fill and rinse at least once. That should clean then up pretty good. You will need to do this every so often to keep them clean.

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Old 11-29-2020, 10:59 AM   #3
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The sensors are screwed into the side of the tanks and the only sign that they are there is the wire running into the tank. I would hesitate to remove one since getting it back in and not leaking might be a problem. There are many cleaning methods out there in net land, most don't work and if they do it is a very temp fix since the problem will reoccur within weeks if not sooner.
If you cannot live with not knowing then one of the add on systems that use external sensors is the only fix.
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Old 11-29-2020, 11:41 AM   #4
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we stopped relying on the sensors long ago. we dump the black tank once a week and the gray tank every 3-4 days but always after dumping the black tank. YMMV depending on the number in your party and size of the tanks.
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Old 11-29-2020, 12:17 PM   #5
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the sensors are indeed inside the tank.i dump black tank maybe once a week as im the only one living here.i dump the grey when i smell it .trust me when ur grey gets full where the level mixes with whats on other side of ptrap it will start to smell a bit.dump it and a little air freshner til next time.
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Old 11-30-2020, 08:49 AM   #6
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Thanks all for the feedback. I'll continue to follow the varies tank sensor cleaning methods periodically.
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