Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
FUEL PRESSURE LEAK DOWN DIAGNOSTIC TEST REFERENCE
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 |
NOTE:
Before continuing visually and physically inspect the fuel delivery system for external leaks or damage. Repair/replace 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. Install special tool #6539 (5/16") 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). 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 POWERTRAIN VERIFICATION TEST VER - 2 .No --> Go To 2 |
All |
| 2 |
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. Remove special tool #C4390.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). Move special tool #C4390, Hose Clamp Pliers, from between the fuel pressure gauge and the engine to 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 POWERTRAIN VERIFICATION TEST VER - 2 .No --> Test Complete. |
All |