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Fuel Transfer Pump
Troubleshooting
Condition
Motor Not Operating
Reduced or No Flow
Water/Moisture in Motor
Pump Body Leakage
Control Nozzle Leakage
On/Off Lever Dificult to
Rotate
On/Off Lever will not turn
pump On
Revision (7-14)
Possible Cause
Blown Fuse
Power supply Voltage is too Low
Jammed Rotor
Brushes Worn or Damaged
Brushes Welded to Communtator
Dirty Filter
Pickup tube sucking air
Blockage
Low Voltage of power supply
Head loss too high
Bypass Valve Stuck Open
Damaged/Worn Seal
Damaged/Worn Seal
Damaged/Worn Seal
Locknut Too Tight
Blown Fuse
Electrical Issue
Damaged/Worn Shaft Assembly
Damaged/Worn Lever Switch
Defective Toggle Switch
Lever Switch Locknut is loose
Changes Since Last Printing
Initial Release
Remedy
Locate the Fuse Holder and replace fuse
Check the electrical connections to the battery.
Recharge the vehicle's battery.
Remove pump access plate and remove any
debris that is stuck between vane, rotor, and/or
inlet/outlet ports.
Replace brushes and/or clean communtator.
Replace ilter cartridge
Disassemble all connections of pickup tube
before pump casting. Clean the threads and ap-
ply new thread sealant. Reassemble according to
assembly instructions.
Disassemble the pump and inspect the system
for any debris that is blocking the luid path.
Inspect the vanes and rotor for signs of damage.
Recharge the vehicle's battery.
Reduce distance from pump to bottom of pickup
tube or raise the luid level of the supply tank.
Remove the Bypass Valve Plug and Bypass
Valve from the pump. Clean the Bypass Valve
and sealing surface of pump housing.
Replace the two seals between the motor and
both casting parts.
Replace pump seal kit.
Using Control Nozzle seal kit, replace all seals.
Probable location for leakage is the O-Ring seal
used in swivel.
Reduce the amount of torque on the locknut.
Locate the Fuse Holder and replace fuse.
Check that the power supply has proper Voltage.
Check and replace if defective.
Ensure that the D-shapped hole on the Lever
Switch is aligned with the slot on the Shaft As-
sembly. Tighten the Locknut to desired torque.
12
SER 3400
Alemite, LLC
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