Why a Shallow Well Won't Hold Prime

Common Causes of Prime Loss

If water drains back down the suction pipe as fast as you pour it in, the foot valve (check valve) at the bottom of the well pipe is likely stuck open, missing, or damaged. Without a functioning foot valve, the pump cannot maintain a water column.

Troubleshooting Steps

1. Pull the well pipe: Remove the suction pipe from the well to inspect the foot valve.
2. Check the valve: Ensure the flapper moves freely and seals tightly. Clean debris from the screen.
3. Inspect the pipe: Look for cracks or loose joints that could leak air.
4. Replace if needed: Foot valves are inexpensive; replace if any doubt exists.

Other Devices

Some systems use a spring-loaded check valve near the pump instead of a foot valve. Verify which type you have and test its operation.

Once the foot valve holds water, priming the pump should be quick and the prime should hold between cycles.