My trailer is brand new and during first camp noticed the gray tank sensor went to 2/3 and then F very quickly. No big deal, I had a full hookup so I just pulled the lever and dumped. Figured I just needed to become aware of how much water we use to wash with, etc. Our gray tank is 30 gal. Same thing happened the next day: very little usage and the sensors quickly showed full. In the meantime, after 3 days of camping with a family of 4, the black tank (also 30 gal) showed 1/3 full. That seemed reasonable to me. Got back home and had time to run some measured experiments today. After 6 gallons, my gray sensor showed 2/3 full and at 12 gal began showing FULL.I understand people's black sensor showing higher than it really ease due to toilet paper or crud clinging to the sensor, but I don't get why my gray sensor would be acting this way since it's at worst soapy water. Thoughts? Ideas to rectify the situation?

when the water nolonger drains or you see paper floating in the pipe they are full do not rely on the sensors they are junk in all of them

Is it possible your gray and black tank are 2 different sizes?Do the same experiment again, only this time, keep filling the gray until water back-up in your drain. Then you'll know REALLY how much is truly holds. Black tank... I never use the sensors. Just look down the toilet hole! Works ok for me.

DutchmenSport wrote:Is it possible your gray and black tank are 2 different sizes?Do the same experiment again, only this time, keep filling the gray until water back-up in your drain. Then you'll know REALLY how much is truly holds. Black tank... I never use the sensors. Just look down the toilet hole! Works ok for me.Sorry, I left that part out: at 26 gallons the gray water began to back up into the tub (you could hear it before it started). I will run the same experiment on the black tanks and report back. I am pulling the specs for the gray and black tank sizes off the manufacturer website but my experiments will tell if these are accurate. In case it matters, the trailer is slightly off level back-to-front with the rear of the trailer lower by 1-2". It was pretty level at the campsite though.

texasAUtiger wrote:DutchmenSport wrote:Is it possible your gray and black tank are 2 different sizes?Do the same experiment again, only this time, keep filling the gray until water back-up in your drain. Then you'll know REALLY how much is truly holds. Black tank... I never use the sensors. Just look down the toilet hole! Works ok for me.Sorry, I left that part out: at 26 gallons the gray water began to back up into the tub (you could hear it before it started). I will run the same experiment on the black tanks and report back. I am pulling the specs for the gray and black tank sizes off the manufacturer website but my experiments will tell if these are accurate. In case it matters, the trailer is slightly off level back-to-front with the rear of the trailer lower by 1-2". It was pretty level at the campsite though.Are you sure the tank is emptying completely when you drain it? Could there be something preventing it from draining all the way?

I have no reason to believe that it is not emptying completely since (1) the outlet doesn't seem to be moving any water (by listening and feeling), and (2) it took about 24 gal for the supposedly 30 gal tank to back up into the tub. I conjecture the 6 gal difference to being out of level. I appreciate all the feedback. Keep it coming.

Sensors on new trailer | Good Sam Community

wing_zealot
Explorer
Jul 08, 2015
texasAUtiger wrote:
DutchmenSport wrote:
Is it possible your gray and black tank are 2 different sizes?

Do the same experiment again, only this time, keep filling the gray until water back-up in your drain. Then you'll know REALLY how much is truly holds.

Black tank... I never use the sensors. Just look down the toilet hole! Works ok for me.

Sorry, I left that part out: at 26 gallons the gray water began to back up into the tub (you could hear it before it started).

I will run the same experiment on the black tanks and report back.

I am pulling the specs for the gray and black tank sizes off the manufacturer website but my experiments will tell if these are accurate.

In case it matters, the trailer is slightly off level back-to-front with the rear of the trailer lower by 1-2". It was pretty level at the campsite though.
Are you sure the tank is emptying completely when you drain it? Could there be something preventing it from draining all the way?
texasAUtiger
Explorer
Jul 08, 2015
DutchmenSport wrote:
Is it possible your gray and black tank are 2 different sizes?

Do the same experiment again, only this time, keep filling the gray until water back-up in your drain. Then you'll know REALLY how much is truly holds.

Black tank... I never use the sensors. Just look down the toilet hole! Works ok for me.

Sorry, I left that part out: at 26 gallons the gray water began to back up into the tub (you could hear it before it started).

I will run the same experiment on the black tanks and report back.

I am pulling the specs for the gray and black tank sizes off the manufacturer website but my experiments will tell if these are accurate.

In case it matters, the trailer is slightly off level back-to-front with the rear of the trailer lower by 1-2". It was pretty level at the campsite though.
DutchmenSport
Explorer
Jul 08, 2015
Is it possible your gray and black tank are 2 different sizes?

Do the same experiment again, only this time, keep filling the gray until water back-up in your drain. Then you'll know REALLY how much is truly holds.

Black tank... I never use the sensors. Just look down the toilet hole! Works ok for me.
newman_fulltime
Explorer II
Jul 08, 2015
when the water nolonger drains or you see paper floating in the pipe they are full do not rely on the sensors they are junk in all of them

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