It takes almost 2 minutes before water gets from the well to the pump. Pump is Goulds 1.5 hp Irrigator (newly installed June 07). Prevoius pump did the same thing (only it made a lot more noise doing it). The 1 1/4 elbow goes down to the well (no info on well) and is located about 20 feet from the pump. Would replacing check valve solve this problem?