Well Pump Loses Prime After Freeze: Re-Priming Steps for Florida System

After a hard freeze cracked the above-ground PVC suction line from well to pump, the homeowner replaced the pipe but now the pump runs without moving water—it must be unplugged to stop. The system has a pressure tank on top. This is classic loss of prime.

Re-Prime the Pump

1. Turn off power to the pump.
2. Remove the prime plug (usually on the pump volute/casing).
3. Fill the pump casing completely with water (use a hose or bucket).
4. Replace the prime plug tightly.
5. Open a hose bib or valve on the discharge side to vent air.
6. Turn on power. The pump should build pressure within 30–60 seconds.
7. Close the vent once steady water flows.

If Priming Fails

• Foot valve / check valve at the bottom of the suction line may be stuck closed, leaking, or missing. This valve holds water in the suction pipe so the pump doesn’t have to re-prime every start.
• Pull the suction pipe (if it’s a shallow well with a well point) and inspect the foot valve. Clean or replace it.
• Check all suction-line joints for air leaks—even a pinhole breaks prime. Use Teflon tape and PVC cement on every joint.
• Ensure the suction line slopes upward continuously to the pump (no high spots that trap air).

Pressure Tank Note

The tank’s air charge should be 2 psi below the pump’s cut-in pressure (e.g., 28 psi for a 30/50 switch). If the bladder is ruptured, the tank will waterlog and cause rapid cycling—replace the tank.

Once primed and the foot valve holds, the system should run automatically. If the pump still cycles rapidly, the pressure switch or tank needs attention.