Originally Posted by lenjen
Is there an air vent in the gray water tank? If so where is it? I’m hoping there is and mine is stopped up as that is my last idea as to why the gray water drains so slow.
Len, The grey water tank has a shape that does not promote fast and or complete draining. the tank is typically only about 4 " tall and is as wide as the coach basement. The outlet is (on mine ) located near the center line of the coach. and uses only about 1 1/2 " abs pipe.
The single roof vent NRV uses may be an issue, as it goes to top of the tank along the coach center line also. The top surface of the tank may have sags between the center and the sides that prevent properly venting to those spaces at the sides until water levels drop enough. The auto vents under the sinks should be checked to improve that effect.
I am considering adding smaller diameter vents to each side one of these days.
More unlikely is a hole cut out left in the tank.
I have found complete and fastest drainage occurs with the coach level side to side and slightly higher in front.
2003 34' Dolphin 5342, W22, UP, UPGBrake, F and R Track Bars, Rear IPD sway bar, Koni FSDs, Safe-T-Plus, Scan Gauge II.. 2004 Jeep Liberty, Blue-Ox Adventa..