Slow Gray Tank Drain

[RVFun4Us]

On our first trip out in our 3055RL Bighorn, one of the problems we had was the very slow drain when dumping our gray water tanks. After some experimenting, I figured out that when the tanks are not full, they drain very slowly (about like a garden hose) but when full, they dump very quickly. I would usually wait to dump if on a full hookup until the tanks are full but that doesn't work when enroute somewhere. Has anyone else had this same problem and if so, what did you do?

 

[ChopperBill]

I am guessing the kitchen drain is running up hill some what. I think mine is. It is ALWAYS slow. When I drain the tanks now I park where the dump valves are at least 6 or more inches lower. Pretty easy to do as I drain at home next to the curb with a Flo jet sewer pump. Mine seems to drain all the gray out that way.