• Pump speed too low
• Air leak in suction lines
• Restriction in suction lines
• Excessive system pressure (flow loss to PCV)
• PCV open, worn or not seated properly
• Worn or damaged pump cartridge

Noise

• Inlet Restriction of:
a. Inlet piping
b. Clogged strainer
• Excessive pump speed
• Pump inadequately fastened to the base plate
• Misaligned pulleys
• Improperly anchored piping
• PCV setting too high
• Excessive time with closed discharge line
• Damaged pump cartridge
• Excessive system pressure

Leakage

1 Port

• Loose piping
• Improperly applied pipe thread sealant

2 Weep Hole

• Damaged shaft seal O-Ring
• Damaged shaft seal

3 Head or Sump Gasket

• Damaged gasket
• Improperly torqued mounting screws

4 Sump Overflow

• Excessively foamy fuel
• Failure of sump float mechanism
• Failure of sump overflow check valve*

Motor/Belt Overheating

• Pump cartridge locked up
• PCV stuck closed
• Excessive speed
• Improper belt tightening or alignment
• Defective or damaged motor

* This applies only to units equipped with the overflow check valve option.