SUMP Problems

[figdish]

I am fairly new to this hobby and recently added a sump to my 60gal. i have an overflow box and a 9.5mag return pump. i put valves on both and have the return turned down real low as the return side of sump keeps drying up. I have to add water at least once every 24 hours so it doesn't dry out and burn my motor. Can anyone advise what I am doing wrong, would appreciate all the help I can get, cheers