

Electric Pump
Mechanical Pump
Major Causes of Fuel Pump Failure
w Misdiagnosis of the vehicle's problem
w Rust, corrosion or other contamination
in the vehicle's fuel tank.
w Clogged or plugged fuel filters and
strainers.
w Faulty on-vehicle fuel pump wiring or
connectors.
Fuel Pressure - If the engine runs but exhibits driveability problems,
check fuel pressure and flow and compare readings to the manufacturer's specs.
w Too High - the most likely cause is a
faulty regulator or a clogged return line.
w Too Low - check for low voltage at the
pump or filter and fuel line blockages.
When Replacing a Fuel Pump,
always:
w Replace the filter or strainer with a
new filter or strainer.
w Professionally flush or clean the fuel
tank.
w Inspect, repair, or replace the suspect
vehicle's connectors or wiring.
w Refer to the Diagnostic/Troubleshooting
and Installation Guidelines document found in the fuel pump box.