So.... does that mean your water pump was also on while you were filling your fresh tank? If you left the bathroom faucet on, the pump would also need to be for it to fill up your black tank.
I am always worried about water leaks.... at home and in the RV. I always turn the water off at home if we are gone for more than a day and I turn off the pump in the RV when we are not using water. I even started shutting off the camp city water if we are gone for the day.
If something started leaking or let loose, I don't want to come back to a mess and water damage.
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