I just bought a harbor freight shallow well pump to pump water out of an old 20' well on my property, mainly to water the lawn. I already have a hand pump with a pvc pipe I ran down the well for a casing that works perfectly. I ran another 1" pvc line down the well for the harbor freight pump and primed between the check valves and the pump itself. When I kick it on it sprays out the water I primed the pump with but won't draw any new water. I can hear the check valve making a shuttering sound but it just seems like the pump doesn't have enough power to draw the water up. The box claims like it can draw up 26 feet and I'd say my waterlevel is about 20 to 21 feet below the pump at max. Am I doing something wrong or does the pump not do what it says? I did test the pump in a bucket of water and it works perfectly. I know I got what I paid for but I'd at least think it should do what the box states.