Fresh Water to Black Water Tank?

[mtdawg]

I have had an interesting situation arise with my Jayco North Point. I filled the fresh water tank, drove to the RV park and the tank showed full. By the next day, the fresh water tank was down 2/3 and the black water tank was showing full. Has this happened to anyone? Is it even possible for the fresh water to be leaking into the black tank? I'm confused and since my nearest Jayco dealer is 100 miles away, I'd rather figure it out on my own. Any comments would be appreciated.

Thanks,
Jim

[abarkl]

There was a very similar discussion on these forums about 3 weeks ago.
Many Jayco models will leak fresh water through overflow tubes while under way.
Most RV black tank sensors are unreliable.
Many owners make the mistake of using the Black Tank Flush connection thinking they are filling the fresh water tank.

[norty1]

It is not possible for that to happen.

It is however possible for one to make a wrong deduction and then go off on a tangent trying to figure out a problem from a incorrect deduction.

[JohnWedell]

Did you use any water during that period. Did the grey tank show a rise in water level. I have heard on some models (not sure which) the bathroom sink was plumbed into the black tank. Otherwise it should not be possible. It's like your fresh water tank filling your neighbors black tank. You may need to supply a little more information.