9
PROBLEM
POSSIBLE CAUSE
SOLUTION
The motor runs but
the pump will not prime
The motor is rotating in the wrong direction
(the battery terminals are reversed)
Reconnect the RED clamp to (+) terminal & BLACK clamp
to ( - ) terminal of battery
The Bypass Valve (11) is dirty / sticky
Inspect Spring (10) & Bypass Valve (11).
Clean / replace if required
There is an air leak in the Suction Tube (38)
or fuel leakage from threaded joints
Inspect Suction Tube (38), hoses, joints and re-seal with
PTFE Tape (34) if required
Pump discharge is low
Low supply voltage
1. Clean the battery clamps & terminals. Ensure that the
supply voltage is 12V or 24V as per the pump model
2. Check wear & tear of Magnet Assembly (14), Armature
Assembly (15) & Carbon Brush Assembly (18). Replace
defective parts
The tank is not vented
Ensure that the tank is vented to atmosphere
There is an air leak in the Suction Tube (38)
or fuel leakage from threaded joints
Inspect Suction Tube (38), hoses, joints and re-seal with
PTFE Tape (34) if required
The Fuel Control Nozzle (28) or suction line
is blocked
1. Ensure that the strainer / filter / hose / nozzle is clean
2. Ensure that the Suction Tube (38) is at least 25 mm
above the bottom of tank & fuel level is not too low
The motor stalls when the
nozzle is closed
Low supply voltage
1. Clean the battery clamps & terminals. Ensure that the
supply voltage is 12V or 24V as per the pump model
2. Check motor & replace if it is faulty
The Bypass Valve (11) is dirty / sticky
Inspect Spring (10) & Bypass Valve (11).
Clean / replace if required
Sticking Vanes (4)
Ensure the Vanes (4) slide freely inside the Rotor (6).
Replace Vanes if required
The switch will not turn ON
the pump
Blown fuse
Open fuse cover located in Battery Cable (26).
Replace blown fuse (15 Amp)
Defective Rocker Switch (25)
Check Rocker Switch (25) and replace it if faulty as per the
following steps:
1. Loosen three Slotted Head Screws (24).
2. Remove Switch Cover
(23) after disconnecting the
coupler attached to it. Grab the locking clips of Rocker
Switch & push outwards to remove it.
Damaged or defective motor
Check wear & tear of Magnet Assembly (14), Armature
Assembly (15) & Carbon Brush Assembly (18).
Replace motor assembly if needed.
Fuel leakage
Pump operating time extended with nozzle
closed
Do not exceed 5 minutes of operation with nozzle closed
Armature shaft worn from Rotor side
Replace Motor Assembly
Motor overheating
Sticking Vanes (4) or Rotor (6) binding
Check to make sure Vanes & Rotor turn freely on shaft
Pump operating time extended with nozzle
closed
Do not exceed 5 minutes of operation with nozzle closed
The Fuel Control Nozzle (28) or suction line
is clogged
Inspect and clean if required
Pump operated for more than 30 minutes
continuously
Limit operation to 30 minutes per hour
TROUBLESHOOTING
(Refer to EXPLODED VIEW - Page 6)
Table 5
