Product Manual

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Problem
Possible Cause
Corrective Action
Motor problems
Contact with the service department
Thermal overload protection
shut-down
Move ON/OFF lever to the OFF
position to reset pump.
Low or no flow rate
Low level in the suction tank
Refill the tank
Foot valve blocked
Clean and/or replace the valve
Filter clogged
Clean the filter
Excessive suction pressure
Lower the pump with respect to the
level.
High loss of head in the circuit
(working with the by-pass open)
Use shorter tubing or of greater
diameter
By-pass valve blocked
Dismantle the valve, clean and/or
replace it
Air entering the pump or the
suction tubing
Check the seals of the connections
A narrowing in the suction tubing
Use tubing suitable for working under
suction pressure
Low rotation speed
Check the voltage at the pump.
Adjust the voltage and/or use cables
of greater cross-section
The suction tubing is resting on
the bottom of the tank
Raise the tubing
Increased pump noise
Cavitations occurring
Reduce suction pressure
Irregular functioning of the by-
pass
Dispense until the air is purged from
the circuit
Air present in the diesel fuel
Verify the suction connections
Leakage from the pump
body
Seal damaged
Check and replace the mechanical
seal