Flotec Corrosion Resistant Shallow Well Jet Pump 1/2HP, 8GPM "u27 470" Questions

...U27-470. Motor no: S48H2EC11. I ran completely out of water and it wont pump. My tank is full off water noe but it wont syay on and wont pump. If I need to prime how do I do that? I dont see were to ...