Wrangler 2WD V6-3.8L (2008)
-
Go to 6
No
-
Go to 5
5. FUEL PUMP MODULE
Turn the ignition off.
WARNING: The fuel system is under a constant pressure even with the engine off. Before testing or servicing any fuel system Line, fitting or
line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death.
Reconnect the Low Pressure Fuel Supply Line from the inlet port of the Fuel Filter/Water Separator.
Reconnect the Injector Back Flow Pressure Fuel Line.
Disconnect the Low Pressure Fuel Supply Line from the outlet port of the Fuel Module on top of the Fuel Tank.
Install a fuel pressure gauge in the outlet port of the Fuel Pump Module.
Turn the ignition on.
With the scan tool, actuate the fuel pump relay control. Observe the fuel pressure gauge.
NOTE: The fuel pressure specification is between 4.5 and 6.0 bar ( 65 and 87 psi.).
CAUTION: Stop all actuation tests before proceeding.
Is the fuel pressure within specification?
Yes
-
Replace the Fuel Pump Module.
-
Perform the PCM Verification Test. See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated
Procedures/Verification Tests/Powertrain Verification Test
No
-
Go to 6
6. FUEL PRESSURE SOLENOID BACK FLOW RETURN LINE
Turn the ignition off.
Disconnect the Back Flow Return Line at the Fuel Pressure Solenoid.
Disconnect the Back Flow Return Line at the Fuel Pump Module on top of the Fuel Tank
Apply air pressure to the Solenoid end of the Back Flow Return Line.
Is air movement evident at the Fuel Pump Module end of the Back Flow Return Line?
Yes
-
Test Complete
No
-
Go to 7
7. HIGH PRESSURE PUMP BACK FLOW RETURN LINE
Turn the ignition off.
