Fuel Supply Troubleshooting

1. Pump not primed
2. Lift too high
3. Rotation direction incorrect
4. Check valve installed backwards

1. Air leak at inlet
2. Defective solenoid valve or check valve
3. Lift too high
4. Pump worn
5. Inoperative foot valve
6. Piping improperly installed
7. Fuel strainer plugged

1. Dirt or grit in fuel
2. Pipe strain on pump causing bind
3. Worn pump/motor coupler
4. Pump has been run dry or with insufficient fuel

1. Leak at inlet
2. End of inlet not deep enough
3. Air or gas in fuel
4. Supply exhausted
5. Vaporization of fuel at inlet
6. Air or gas in inlet line
7. Sand or abrasives in fuel

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

1. Insufficient fuel supply
2. Air leaks in the inlet pipe
3. Air or gas at the inlet connection
4. Pump and motor out of alignment
5. Worn out spider coupling
6. Pump coupler out of balance

1. Air in plumbing lines
2. Liquid heavy or too viscous
3. Bent pump shaft binding rotating element
4. Misalignment of pump/motor coupler

1. Inoperative foot valve
2. Inoperative check valve
3. Inoperative solenoid valve
4. Pump cavitation
5. Plumbing air leaks
6. Lift too high
7. Pump seals leaking

1. Control power not available
2. Motor thermal overload condition
3. Pump failed and seized
4. Motor failure