I have an '03 Ranger Comanche and filling the livewells is dealing me the blues. I do not have a fill label on my 3 position switch...it reads recirc, auto, and empty. Since I know what two of those are for I am assuming to fill the wells it will have to be in auto? When I turn pumps on though it only fills about 6 inches of water...Either I am doing something wrong or I have some issue not letting it fill. Any elp would be greatly appreciated!!
Do you possibly have a Flow-Rite pump out aerator similar to this? If so it needs to be pushed in otherwise it will be in the pump out position. Since you said that it fills only about 6 inches it doesn't sound like the pump is filling it at all. The drain is open and it is just filling to the hulls water level depth.
Other things to check
1) Clogged inlet
2) Pump being unable to draw in water due to losing prime or possibly split hose
3) Bad livewell pump or pump cartridge.