Have a well approx 50' deep with a 1/2 hp jet pump. This pump was new 1 1/2 yrs ago. About six months ago we discontinued using this well and just yesterday tried to get it going again. I poured water into pump base until full and started pump, but no water. Took plug out and still full of water; turned pump on and the water doesen't even bubble. The pump is connected to galv pressure tank (no bladder) but I do not have the pressure tank outlet connected to the water line at this time. Do I need to have pressure against pump to get it to prime? Any suggestions? Thankyou.