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Old 12-07-2018, 02:15 PM   #1
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Location of tank Sensors

5th wheel 2013 Crusader 295 RST:


Has anyone found, located, replaced the sensors in the Black / Grey / Galley Tanks?


I want to replace mine (Bought unit New, black and grey are not working properly)


Don't want to cut up the under belly on a search and destroy mission ;-)


if anyone knows, or has replaced these sensors could you tell me the point of attack.


Thanks!
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Old 12-07-2018, 03:25 PM   #2
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If by "black and grey are not working properly" you mean they are not reading empty when you know the tanks are empty that, unfortunately, is par for the course. "Stuff" sticks to the sensors when the tanks are drained and then they give inaccurate readings. The black tank tends to be more problematic than the grey tank, but an improperly maintained grey tank will give false readings eventually. There are literally hundreds of threads on these forums about tank sensors. You can use the search function to find them and see how others have dealt with the issue.
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Old 12-07-2018, 03:38 PM   #3
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If they are standard sensors, they are inserted through the sides of EACH of the mentioned tanks... so they are not all in the same place. You might have to drop the coroplast bottom covering IF you must get to all of them. But first, you should see the info. in post #2.
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Old 12-07-2018, 04:21 PM   #4
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Tank Sensor Location

Quote:
Originally Posted by KeithInUpstateNY View Post
If by "black and grey are not working properly" you mean they are not reading empty when you know the tanks are empty that, unfortunately, is par for the course. "Stuff" sticks to the sensors when the tanks are drained and then they give inaccurate readings. The black tank tends to be more problematic than the grey tank, but an improperly maintained grey tank will give false readings eventually. There are literally hundreds of threads on these forums about tank sensors. You can use the search function to find them and see how others have dealt with the issue.

Not Working Properly = Reading 1/3 - 2/3 full when empty.


I plan to REPLACE the sensors (Grey and Black, Galley and fresh work for the time being). All cleaning , geo methods did not work. I have a black tank flush that I do every dump. Gauges worked for the first 3 years, last two, not so much.
I'm trying to get a idea exactly where the tanks are located (and what side of the tank the sensors are located) so I can minimize cutting the under body plastic.


https://www.amazon.com/Valterra-T213.../dp/B00YJIB7WE


as you can see replacing the sensors would require a bit of access to unscrew and replace 4 for each tank, so if I could get a idea exactly where the tanks are located on a Crusader 5th wheel 295RST from someone who has tackled this before.
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Old 12-07-2018, 06:03 PM   #5
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On my trailer all four sets of sensors were on the road side of the trailer. About middle of the tanks. Located next to the drains.
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Old 12-07-2018, 06:22 PM   #6
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Apologies, I misread 2013 as 2018 and you said you bought your trailer new, so I thought it was new this rl year. So my response was off base, but I don't seem to be able to delete it.
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Old 12-08-2018, 09:22 PM   #7
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Doubt the new sensors will be accurate for three years, not worth the trouble IMO. I never look at mine, have not for years. I've never been bored enough to consider a replacement.
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Old 12-08-2018, 09:47 PM   #8
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Old 12-08-2018, 09:56 PM   #9
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You were lucky that your OEM sensors DID work reliably for 3 years ... like mentioned 80% of us don't rely on them ... we just know about how long we can go before the tank is near full. I agree, the sensors are on the street side of your RV. I may be wrong, but I think you're going to have to drill new holes as the OEM sensors are not mounted the same way the Horst sensors you linked us to ... at least my OEM sensors are not. The wiring will interchange though.
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Old 12-08-2018, 10:39 PM   #10
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Screwy...

Quote:
Originally Posted by GeoArm View Post
Not Working Properly = Reading 1/3 - 2/3 full when empty.

I plan to REPLACE the sensors (Grey and Black, Galley and fresh work for the time being). All cleaning , geo methods did not work. I have a black tank flush that I do every dump. Gauges worked for the first 3 years, last two, not so much.
I'm trying to get a idea exactly where the tanks are located (and what side of the tank the sensors are located) so I can minimize cutting the under body plastic.

https://www.amazon.com/Valterra-T213.../dp/B00YJIB7WE

as you can see replacing the sensors would require a bit of access to unscrew and replace 4 for each tank, so if I could get a idea exactly where the tanks are located on a Crusader 5th wheel 295RST from someone who has tackled this before.
Umm, the OEM sensors are not likely to be screwed in. They are usually "spin-welded" in. The sensor body is tapered (cone-shaped) up to the last segment which is straight. An undersize hole is drilled in the tank. The sensor body is started and driven with a socket on an electric drill. The heat caused by friction melts the plastic enough to allow the sensor to fully seat. When the rotation stops, the plastic solidifies into a water-tight seal.

I wouldn't attempt to add/change sensors unless one was leaking, but if you proceed, you would probably be best-advised to leave the old ones in place and install a new one alongside each old one (to get the height right).

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Old 12-08-2018, 10:52 PM   #11
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On my Wildcat my sensors are not spun in to form a melted plastic seal. Mine have an internal and an external rubber seal... like little grommets. A little nut on its stem is tightened to widen the rubber seal. I’ve had a couple out of my galley tank to clean them. Easy in and out if I disregard the “crick” in my neck.
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Old 12-08-2018, 11:45 PM   #12
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My 16 Silverback sensors are like what Larry better described than I tried to. Spin Weld as he stated. I had to replace my fresh water tank and both OEM and replacement tanks had the spin weld sensors as did my grey and black. I guess it depends on the model and year.
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Old 12-09-2018, 12:45 AM   #13
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Personally, if I were going to replace the sensors, which I will probably never do. I would go with the SeeLevel system. Shields or not, I believe crud will build up on any sensor put inside the tanks. Calcium in the FW and "stuff" in all the others...

https://www.garnetinstruments.com/rv-shop/products/
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Old 12-09-2018, 06:53 AM   #14
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You can clean them. Use a good cleaner and flush and spray a lot of water.
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Old 12-09-2018, 04:10 PM   #15
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Don't waster your time replacing sensors. They too will go to pot in about a year. Learn your camper, learn your time and empty according to schedule. Sensors always get stuff on them and they will always give false readings. Fresh water tank is about the only good one. When the toilet burps, empty it out. When the sinks wont drain, empty the tank.
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Old 12-09-2018, 08:43 PM   #16
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Before the sinks don't drain...

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Don't waster your time replacing sensors. They too will go to pot in about a year. Learn your camper, learn your time and empty according to schedule. Sensors always get stuff on them and they will always give false readings. Fresh water tank is about the only good one. When the toilet burps, empty it out. When the sinks wont drain, empty the tank.
> When the sinks wont drain, empty the tank..
Well, maybe if you have a galley tank just for the sinks. Otherwise, the first sign of a full gray water tank is a puddle in the shower. That drain is much lower than the sinks and is the first thing to show when the gray tank is overfull.

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Old 12-09-2018, 08:55 PM   #17
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Quote:
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> When the sinks wont drain, empty the tank..
Well, maybe if you have a galley tank just for the sinks. Otherwise, the first sign of a full gray water tank is a puddle in the shower. That drain is much lower than the sinks and is the first thing to show when the gray tank is overfull.

Larry
Our shower drain is upstairs about three feet higher than the galley sink, once the galley sink wont drain nothing drains it is full. The clothes washer and bathroom sinks have there own separate tank. Of course all units are different if not the same model, even than they may be different.
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Old 12-09-2018, 09:48 PM   #18
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5th Wheel?

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Our shower drain is upstairs about three feet higher than the galley sink, once the galley sink wont drain nothing drains it is full. The clothes washer and bathroom sinks have there own separate tank. Of course all units are different if not the same model, even than they may be different.
Must be a fifth wheel, right? No steps in our Cherokee 38P, 38-foot destination trailer, all on one level. The shower pan is lower than both sinks. No washer or dryer.

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Old 12-09-2018, 10:23 PM   #19
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Never used any sensors they are so inaccurate.......... after years of camping just pretty much know when the tanks need to be emptied.



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Old 12-09-2018, 11:15 PM   #20
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I would never attempt sensor replacement. Even when mine are dirty, the full sensor is mostly accurate. And as others have stated, after a bit you know how many days you can go with each tank.

If you are intent on doing this, dropping the entire coroplast bottom is better in the long run and will make the job easier. Cutting access flaps and taping shut seem to be problematic later on. The sensors can be anywhere on the tank depending on who was doing the install that day.

I've dropped the bottom on mine several times. Not that bad a job. Amazing what you discover when you open it up!!! Getting it back on is easier with a helper, but doable solo. Buy some of that expanding spray foam to seal any loose edges and protrusions and you are good. I used some extra screws and the result was a better fit than from the factory.

Good luck!
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