Newer water pumps incorporate a bypass design. If the pressure switch is improperly adjusted the pump won't shut off.
If it's a Shur Flo 4008 pump here's the pertinent information on the bypass adjustment from the manual.
Quote:
About The By-Pass NOTE: By-pass adjustment should be performed by professional technicians with proper
gauges and equipment.
The by-pass is a spring loaded diaphragm that opens up allowing water from the discharge side back to the inlet side.
The by-pass is set to begin opening at about 40 psi and creating full by-pass at about 62 psi (for 55 psi models), lower
pressure pumps will vary depending on the by-pass and pressure switch settings. If the switch or by -pass are adjusted too
much, the by-pass and switch shut-off can overlap and THE PUMP WILL NOT SHUT OFF. Screwing the switch screw in
clockwise will raise the shut-off pressure. Unscrewing the switch screw counterclockwise will lower the pump shut-off pressure. Screwing the by-pass screw in will raise the pressure at which the by-pass starts and raise the full by-pass pressure.
Unscrewing the by-pass screw counterclockwise will lower the pressure at which by-pass starts and lower the full by-pass
pressure. WARNING: If full by-pass is reached before the shut-off setting, the pump will not shut off. Full by-pass
pressure setting should be at least 5 psi higher than pump shut off pressure.
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Also, be sure the check valve isn't held open by foreign material. Could be as simple as a piece of teflon pipe tape that made it's way through the system.
Here's the full manual:
https://www.northerntool.com/images/...uals/32389.pdf
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