Black Tank Dump Valve
When I dump a full black tank, the valve opens very easy, no problem. I flush the tank for 5 to 10 minutes, then I close the valve for 5 minutes to let it partially fill. When I then pull the handle t...
Forum Discussion
Lynnmor wrote:Durb wrote:
Do you turn off the water to the black tank rinse before opening the valve? Could be the incoming water is building pressure inside the tank and binding the valve.
Good thought. The tank has a vent thru the roof and can only build pressure if that vent is blocked. What can happen is that the vent pipe slipped down into the tank and is now under water, or even worse, resting on the bottom.
If I recall correctly, the roof top vent cap is attached to the vent pipe with screws. So it seems unlikely that the pipe slipped down; however, if it did, then the vent cap should be missing. At any rate, I'll check out this possibility.
