Originally Posted by Oaklevel
Are you at a full hook up site?? Or anywhere near a dump station. If so let the water in the grey tanks drain out. Are you 100% positive that the grey tanks were empty. The dealer normally would have run water to test the the system before your PDI and forgot left it running and filled it / them ???? Just a thought.
Also did you fill your fresh water tank?? If so was the pump off?
The shower being the low point will fill first when the tanks are full.
Good Luck hopefully it is something minor.
Thank you for the thoughts and suggestions. FRF = Forest River Forester which is a motorhome on Mercedes Benz Chassis.
1. We are a camp with a sewer hookup. That is how we learned that as soon as we released the the holding tank valve all would drain normally. As soo as we close it, it stops (within a gallon or so...or my estimation of what it would take to fill the pipe....no way in the world the holding tank is full. We did this several times.
2. Oddly enough, the shower would not drain the shower water, but the VERY little backup (other than the running water in the kitchen staying in kitchen sink (etc), was it appeared a little would back up from kitchen into bathroom
3. I believe the pump was off when the fresh water tank was filled....definitely was not running water. Not sure I understand what this could have had to do with it?
I can not think of better words to describe it...but when the grey holding holding tank valve was closed (preventing from draining straight to camp sewer) and the sinks and shower were backing up with their own running water, every once in awhile we would hear a 5 second or so gurgling sound...something like when we have at something that did not here something and your intestines make a prolonged gurgling sound.....