Shur dri sd 520 not pumping water

I have a shur-dri sd520 weel pump. The well is 73 feet deep. The top water line is 25 feet down. The foot valve is 50 feet down. I have a new foot switch. I prime the pump and the water stays full in the pump even after days. The pump runs and I hear the insides moving. I have pulled the pump apart just to make sure everything is clear and moves. I have the 1 1/4 suction line and the 1 inch line all hooked up. The pump will not pump water? Any ideas to try.

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