Help me-i'm thirsty for well water

Frustrated newbie. Have a 24" cased well dug in 1960s in GA. Replaced pump 2008 Flotec FP 4300 series, not used in past 2 years. Piped as a deep well circuit. Pump runs fine on 110v power supply, no water flow. Pulled foot valve, leaked. Replaced. Dropped weighted string, water at 54 feet. Bottom 6 feet of string was wet. Pipes measure 57 feet and foot valve is wet when pulled up, with no mud nor sand on it. Primed pump as per user manual: removed pressure gauge, opened control valve, filled with water, closed control valve. Startup: weak flow for 1 min then dry. Pressure zero to 15psi then slow decline to zero. Called Flotec. Was told 1 1/4" outflow pipe must have a leak. Pulled foot valve, placed in 5 gal bucket, brisk flow, sucked 5 gal in 10 sec. Looks like pump works fine. Plastered outflow elbows with shaving cream. Dropped footvalve back down well, reprimed, no "dimpling" of shaving cream. No leak found! No water flow from well. I see ripples in water at bottom of well when I shake the pipes. Why can I not pump water from this well?