Quick Answer
A jet pump losing prime frequently is often due to air intrusion, suction issues, or low water table levels. Improper installation, low suction pipe diameter, and incorrect plumbing can also contribute to the problem. Inspecting the pump and plumbing is essential to identify the root cause.
Causes of Air Intrusion
Air intrusion is a common reason for jet pumps to lose prime. This occurs when air enters the suction line, either through the well casing, pump seal, or other points of entry. To prevent air intrusion, ensure that the well casing is properly sealed at the surface, and consider installing a well cap or seal. Additionally, check for any cracks or damage to the suction pipe or fittings.
Inspecting the Pump and Plumbing
Inspect the pump and plumbing for any signs of damage, corrosion, or wear. Check the suction pipe diameter and ensure it’s not too small for the pump. A general rule of thumb is to use a suction pipe diameter of at least 1.25 inches (32 mm) for a shallow well jet pump. Also, verify that the pump is installed at the correct depth and angle to ensure proper suction.
Troubleshooting Tips
When troubleshooting a jet pump losing prime, start by checking the water table level. If the level is too low, consider installing a deeper well or a submersible pump. Next, inspect the suction pipe and fittings for any blockages or damage. Use a pressure gauge to test the suction pressure, which should be around 10-15 PSI (0.7-1.0 bar) for a shallow well jet pump. If the pressure is too low, consider increasing the suction pipe diameter or installing a booster pump.
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