RESOURCE CENTER

System Troubleshooting

Below is a symptom troubleshooting guide pulled from various system manuals. If this guide does not address the issues you are experiencing or if you need additional troubleshooting support, please fill out the troubleshooting form below or reach out by phone (+1-877-425-4239) during AXI International’s operating hours (Monday – Friday, 8am – 5pm EST) .

Fuel Delivery:

  1. Pump does not run
  2. Pump is not primed
  3. Fuel supply line blocked
  4. Excessive lift
  5. Air leak in fuel supply to pump
  6. Intake or outlet valve closed
  7. Check valve installed backwards

  1. Air leak at inlet
  2. Defective pressure relief valve or check valve
  3. Excessive lift
  4. Pump worn
  5. Inoperative foot valve
  6. Piping improperly installed or dimensioned
  7. Primary filter/water separator plugged

Pump/Motor:

  1. Worn pump/motor coupler
  2. Pump has been run dry or with insufficient fuel for extended periods of time
  3. Plumbing on inlet side not appropriately dimensioned

  1. Liquid too viscous
  2. Bent pump shaft, binding rotor
  3. Misalignment of pump/motor coupler

  1. Control power not available
  2. Supply voltage is too low and/or incorrect
  3. Motor thermal overload condition
  4. Pump failed and seized
  5. Motor failure

  1. Loose pump plumbing fittings
  2. Worn pump shaft seal
  3. Pump pressure relief valve failure
  4. Fuel leak elsewhere and fuel dripping or running towards the pump
  5. Excessive head from overhead storage tank
  6. Worn pump O-rings or seals

  1. Inoperative foot valve
  2. Inoperative check valve
  3. Inoperative solenoid valve (optional)
  4. Pump cavitation
  5. Plumbing air leaks
  6. Lift too high
  7. Leaking pump seal

Alarms/Switches:

  1. Heavily contaminated fuel/excessive water in tank
  2. Restriction in plumbing on inlet side too high
  3. Excessive lift
  4. Inoperative foot valve
  5. Inlet ball valve not fully open
  6. Suction line clogged
  7. Vacuum Switch adjustment may be needed

  1. Heavily contaminated fuel/excessive water in tank
  2. Restriction in plumbing on discharge side too high
  3. Head on discharge side too high
  4. Check valve stuck or defective
  5. Outlet ball valve not fully open
  6. Discharge line clogged
  7. Pressure Switch adjustment may be needed

  1. Inoperative foot valve
  2. Inoperative check valve
  3. Inoperative solenoid valve (optional)
  4. Pump cavitation
  5. Plumbing air leaks
  6. Lift too high
  7. Leaking pump seal
  8. Pump’s internal bypass/pressure relief valve cracking pressure is under 30 PSI.
  9. Flow Switch adjustment may be needed

  1. Stuck float
  2. Missing float
  3. Wiring Disconnected

Misc.:

  1. Insufficient fuel supply
  2. Air leaks in the inlet pipe
  3. Air in fuel on the suction side
  4. Pump and motor out of alignment
  5. Worn out spider coupling
  6. Pump coupler out of balance