Avenger V6-2.7L (2008)
Fuel Pressure: Testing and Inspection
Fuel Pressure Leak Down Test
*CHECKING FOR FUEL PRESSURE LEAK DOWN
For a complete wiring diagram Consult Diagrams/Electrical.
Diagnostic Test
1. FUEL PUMP MODULE
NOTE: Before continuing, thoroughly inspect the fuel delivery system. Repair or replace any damaged or leaking parts as necessary.
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 hose, fitting or
line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death.
Install special tool #6539 (5/16") or #6631 (3/8") fuel line adapter.
Install the fuel pressure gauge.
Start the engine and allow the fuel system to reach maximum pressure.
Turn the ignition off.
NOTE: Fuel specification is 407 KPa +/- 34 KPa (59 psi +/- 5 psi). If the fuel pressure is not within specification refer to Checking The Fuel
Delivery System.
Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and the engine.
Monitor the fuel pressure gauge for a minimum of 5 minutes.
NOTE: The pressure should not fall below 241 KPa (35 psi)
Does the fuel pressure drop?
Yes
-
Replace 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 2
2. FUEL INJECTOR(S)
WARNING: The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting or
line, the fuel system pressure must be released. Failure to follow these instructions can result in personal injury or death.
Remove special tool #C4390.
Start the engine and allow the fuel system to reach maximum pressure.
Turn the ignition off.
NOTE: NOTE: Fuel specification is 407 KPa +/- 34 KPa (59 psi +/- 5 psi).
Using special tool #C4390, Hose Clamp Pliers, pinch the rubber fuel line between the fuel pressure gauge and fuel pump module.
Monitor the fuel pressure gauge for a minimum of 5 minutes.
NOTE: The pressure should not fall below 241 KPa (35 psi)
Does the fuel pressure drop?
Yes
-
Replace the leaking fuel injectors.
-
Perform the PCM Verification Test.See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated
