{"id":1250,"date":"2026-09-03T09:47:00","date_gmt":"2026-09-03T01:47:00","guid":{"rendered":"https:\/\/borrapumps.com\/blog\/how-to-prime-a-well-pump\/"},"modified":"2026-09-06T01:00:01","modified_gmt":"2026-09-05T17:00:01","slug":"how-to-prime-a-well-pump","status":"publish","type":"post","link":"https:\/\/borrapumps.com\/ru\/blog\/how-to-prime-a-well-pump\/","title":{"rendered":"How to Prime a Well Pump: Safe Steps and Troubleshooting"},"content":{"rendered":"

To prime a well pump, first confirm that it is a surface jet or centrifugal pump that actually requires manual priming. Isolate power, close or position valves as the manufacturer directs, remove the priming plug, fill the pump casing and suction line with clean water, reinstall the plug, restore the correct valve position, start the pump, and watch pressure and flow. Never run the pump dry. A down-well submersible pump normally does not use this surface-pump priming procedure; loss of water from that system calls for diagnosis of power, controls, water level, piping, and check valves.<\/p>\n

This article is a practical diagnostic and procurement guide, not a substitute for the pump manufacturer's instructions, an approved system design, current electrical and plumbing rules, or qualified site service. Isolate energy and pressure before opening equipment. Well work, lifting, confined spaces, wastewater, wet electrical locations, and energized testing require competent personnel and task-specific controls.<\/p>\n

Contents<\/strong><\/p>\n
    \n
  1. Confirm the pump type before adding water<\/a><\/li>\n
  2. Prepare the system safely<\/a><\/li>\n
  3. Fill the casing and suction line<\/a><\/li>\n
  4. Start, vent, and observe<\/a><\/li>\n
  5. Troubleshoot repeated loss of prime<\/a><\/li>\n
  6. Know when to stop and call a professional<\/a><\/li>\n
  7. Decision table<\/a><\/li>\n
  8. Frequently asked questions<\/a><\/li>\n<\/ol>\n<\/div>\n

    Confirm the pump type before adding water<\/h2>\n

    Surface shallow-well jet pumps and some convertible jet pumps need the casing and suction path filled before they can create dependable suction. A submersible well pump sits below water and pushes upward; pouring water into a surface housing is not its normal startup method. Read the model instructions and trace the pipework. Identify the priming port, pressure tank connection, discharge valve, foot or check valve, ejector arrangement, and any drain plugs. If the pump ran dry, find out why before restarting. A low well level, suction leak, failed check valve, blocked intake, frozen line, or control fault will not be cured by repeatedly adding water.<\/p>\n

    Prepare the system safely<\/h2>\n
    \"how
    how do i prime a well pump \u2014 prepare the system safely. BORRAPUMP media library; illustrative context, not a performance claim.<\/figcaption><\/figure>\n

    Disconnect and verify power before removing a plug or opening a pump. Let hot equipment cool and release trapped pressure. Use clean water suitable for the system; do not introduce debris, oil, disinfectant, or an unapproved liquid. Inspect the priming-plug threads and seal, visible pipe joints, suction hose, unions, and valves. A suction connection can admit air without leaking visible water. Confirm that the suction pipe is supported, the foot valve remains submerged, and the well or source has enough water. Keep people clear of rotating equipment and never bypass overload, dry-run, or pressure protection to force a start.<\/p>\n

    Fill the casing and suction line<\/h2>\n

    With power isolated, open the specified priming port and add water slowly until the casing is full and the level remains stable. A long suction line may take repeated filling as trapped air escapes. Some layouts use a separate priming tee or require a discharge valve position that lets air leave; follow the approved drawing. Replace the priming plug securely without damaging threads. Do not seal over a fault with excessive tape or force. If the water immediately drains away, suspect a leaking foot valve, check valve, fitting, or suction pipe. Correct that loss before attempting a normal run.<\/p>\n

    Decision table<\/h2>\n
    \n\n\n\n\n\n\n\n\n
    Observation<\/th>\nLikely area to check<\/th>\nSafe next action<\/th>\n<\/tr>\n<\/thead>\n
    Water will not stay in casing<\/td>\nFoot\/check valve or suction leak<\/td>\nKeep power off; inspect the suction path<\/td>\n<\/tr>\n
    Motor runs but no pressure develops<\/td>\nAir, low source level, blockage, excessive lift<\/td>\nStop within the permitted time and diagnose<\/td>\n<\/tr>\n
    Prime is lost after shutdown<\/td>\nDrain-back or air entry<\/td>\nTest valves, plugs, seal and joints<\/td>\n<\/tr>\n
    Submersible system has no water<\/td>\nPower, controls, level, pipe or pump<\/td>\nDo not use a surface priming procedure<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    Start, vent, and observe<\/h2>\n
    \"how
    how do i prime a well pump \u2014 start, vent, and observe. BORRAPUMP media library; illustrative context, not a performance claim.<\/figcaption><\/figure>\n

    Restore the prescribed valve positions, energize the pump, and observe it from a safe location. Pressure should develop and flow should become steady within the time stated by the manufacturer. Some systems need a controlled vent path for residual air. Stop promptly if pressure does not rise, the sound becomes harsh, the casing heats, the motor overloads, or the pump exceeds the allowed dry-running time. After successful priming, check for leaks, stable pressure-switch operation, normal tank cycling, and water clarity. Record how long priming took; a worsening trend often reveals loss of prime or suction-side leakage.<\/p>\n

    Troubleshoot repeated loss of prime<\/h2>\n

    Repeated priming is evidence, not normal maintenance. Check the foot or check valve, every suction joint, mechanical seal, priming plug, drain plug, suction pipe slope, intake submergence, and well level. Look for a suction lift beyond the pump's approved capability, excessive friction, clogged screen, air pocket, or an ejector mismatch. Measure pressure, flow, voltage, current, and pumping water level rather than guessing from sound alone. If the pump has lost prime after a long shutdown, isolate whether water drains back or air enters. Repair the cause and retest the complete system.<\/p>\n

    Know when to stop and call a professional<\/h2>\n
    \"how
    how do i prime a well pump \u2014 know when to stop and call a professional. BORRAPUMP media library; illustrative context, not a performance claim.<\/figcaption><\/figure>\n

    Stop if wiring is damaged, the breaker trips, the motor hums without turning, the pump overheats, the well may be dry, sanitary integrity is uncertain, or lifting and down-well work are required. A potable well can be contaminated by careless opening or unclean tools. A technician may need to test the pressure switch, capacitor or control box, motor circuit, check valves, water level, pump curve, and underground piping. Provide the model, well record, pump setting, symptoms, recent work, pressure readings, and timing of the failure so the visit begins with useful evidence.<\/p>\n

    System selection, evidence, and procurement record<\/h2>\n

    A well-pump decision should begin with the well record rather than the nameplate on the failed unit. Record drilled depth, casing diameter, static water level, pumping water level at a stated test flow, recovery, water quality, pump setting, rising-main size, pressure setting, storage volume, supply voltage, and the present control sequence. The pumping level\u2014not the bottom of the well\u2014is the starting point for the lift calculation. Add discharge pressure and pipe losses to establish total dynamic head, then compare the expected operating range with a current certified curve. The sustainable yield of the well can be lower than the short-term demand of the building. Storage and controls may therefore be more important than selecting a larger pump.<\/p>\n

    Treat electrical and hydraulic evidence as one record. Pressure, flow, water level, voltage, running current, starting behavior, insulation condition, runtime, starts, and controller events help separate a pump fault from a dry or declining well, leaking pipe, failed check valve, waterlogged pressure tank, obstructed line, low voltage, or incorrect control setting. Measurements must be made with suitable instruments by people qualified for the work. Never open energized equipment, pull a submersible pump, or enter a well enclosure without the required isolation, lifting plan, sanitation controls, and site procedure.<\/p>\n

    For procurement, ask every supplier to quote the same boundary: pump and motor, cable, splice, rising main, check valves, wellhead fittings, pressure tank, sensors, controller, protection, installation, lifting, testing, documentation, commissioning, and disposal of removed equipment. Compare the complete installed scope rather than the pump price alone. Require dimensional data, materials, curve, absorbed power, motor data, minimum submergence, cooling requirements, permitted starts, controls, installation instructions, test records, spares, and warranty conditions. At commissioning, preserve baseline readings so future diagnosis can distinguish normal aging from a changed well or system.<\/p>\n

    How this topic connects to BORRAPUMP equipment<\/h2>\n

    This guide supports early review of how do i prime a well pump<\/a> applications. It does not assign a final model. Send the liquid, flow range, total head, source and destination levels, solids, duty cycle, power, controls, site conditions, quantity, destination, and required approvals so equipment can be checked against the real service.<\/p>\n

    Related BORRAPUMP engineering guides<\/h2>\n
      \n
    • types of well pumps<\/a><\/li>\n
    • deep well pump selection<\/a><\/li>\n
    • self-priming pump troubleshooting<\/a><\/li>\n<\/ul>\n

      Authoritative sources and further learning<\/h2>\n

      U.S. EPA private drinking water wells<\/a>; USGS groundwater basics<\/a>; OSHA control of hazardous energy<\/a>. These sources provide general engineering, water, environmental, or safety context; current local rules, approved designs, and equipment instructions remain controlling.<\/p>\n