A 24' deep shallow well with an 18' water table uses a 2 HP pump with 1-1/4" drive pipe and 1" outlet. After priming, it works well, but after shutdown it only re-primes if the plug on the discharge tee is removed for ~15 seconds to release pressure. The backflow valve is 2" from the pump with no room to move it.
The backflow valve location is not the issue. The problem is likely the foot valve (check valve) at the bottom of the suction line not holding water, allowing the column to drain back. Alternatively, a leak in the suction line or a loose fitting lets air in. Check that the foot valve seals tightly, all connections are snug, and the suction line has no cracks. The plug removal vents trapped air, letting water rise to re-prime.
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