No Fuel Delivered
- Pump not primed
- Lift too high
- Rotation direction incorrect
- Check valve installed backwards
Insufficient Fuel Delivered
- Air leak at inlet
- Defective solenoid valve or check valve
- Lift too high
- Pump worn
- Inoperative foot valve
- Piping improperly installed
- Fuel strainer plugged
Rapid Pump Wear
- Dirt or grit in fuel
- Pipe strain on pump causing bind
- Worn pump/motor coupler
- Pump has been run dry or with insufficient fuel
Pump Delivers for Short Period and Quits
- Leak at inlet
- End of inlet not deep enough
- Air or gas in fuel
- Supply exhausted
- Vaporization of fuel at inlet
- Air or gas in inlet line
- Sand or abrasives in fuel
Leaks Fuel
- Loose pump plumbing fittings
- Worn pump shaft seal
- Pump pressure relief valve failure
- Fuel leak elsewhere running towards pump area
- Excessive head from overhead storage tank
- Worn pump O-rings
Noisy Operation
- Insufficient fuel supply
- Air leaks in the inlet pipe
- Air or gas at the inlet connection
- Pump and motor out of alignment
- Worn out spider coupling
- Pump coupler out of balance
Pump Requires Too Much Power
- Air in plumbing lines
- Liquid heavy or too viscous
- Bent pump shaft binding rotating element
- Misalignment of pump/motor coupler
Pump Requires Frequent Re-priming
- Inoperative foot valve
- Inoperative check valve
- Inoperative solenoid valve
- Pump cavitation
- Plumbing air leaks
- Lift too high
- Pump seals leaking
Motor Does Not Turn or Turns Intermittently
- Control power not available
- Motor thermal overload condition
- Pump failed and seized
- Motor failure
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