REV03016704010220
22
Troubleshooting
Symptom Troubleshooting Guide
No 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
Insufficient fuel delivered
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
Rapid pump wear
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
Alarm “HIGH VACUUM ALARM” comes on with clean
or new filter element installed
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
Alarm “HIGH PRESSURE ALARM” comes on with
clean or new filter element installed
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
Pump requires too much power
1.
Liquid too viscous
2.
Bent pump shaft, binding rotor
3.
Misalignment of pump/motor coupler
Noisy operation
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
Alarm “NO FLOW ALARM” comes on or pump requires
frequent re-priming
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 48-50 PSI.
Motor does not turn or turns intermittently
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
Pump leaks fuel
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
Summary of Contents for STS 6003
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