All units I've seen with the built in flush system have a sticker that says to never utilize the flush system with the sewer outlet valve closed. I do close the black valve on mine when I flush, but we watch the tank level closely and when it starts to "bump" the FULL indicator I open the black valve and dump again. I've never had any problems doing this.
I did have to have the black tank replaced on my previous fiver. The factory cut the hose that runs from the valve box to the black tank too short. When the unit flexed during travel, the hose pulled tight and broke the molded fitting off the black tank. When I went to flush, water poured out from under the insulation. There was no fix other than replacing the tank. Thankfully, it was still under warranty at the time.
__________________
Mike in Tennessee
2007 Cruiser 30QB
2008 Ford F250 Lariat 4x4 6.4 Powerstroke
Valley 16K slider
Ride-Rite air bags
|