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Grand Cherokee 2WD V6-3.7L (2008)

Maintenance > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > System Diagnosis > Fuel Delivery Check > Page 1827

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Diagnostic Test

1. FUEL PUMP OPERATION

Ignition on, engine not running.

With a scan tool, actuate the Fuel System test.

NOTE:  It may be necessary to use a mechanics stethoscope in the next step.

Listen for fuel pump operation at the fuel tank.

Does the Fuel Pump operate?

Yes

-

Go To 2

No

-

Go To 5

CAUTION:  Stop All Actuations.

2. FUEL PRESSURE

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.

Turn the ignition off.

Install a fuel pressure gauge at the engine.

Ignition on, engine not running.

With the scan tool, actuate the ASD Fuel System test and observe the fuel pressure gauge.

NOTE:  Fuel pressure specification is 407 KPa ± 34 KPa (59 psi ± 5 psi).

CAUTION:  Stop All Actuations.

Choose a conclusion that best matches your fuel pressure reading.

Below Specification

-

Go To 3

Within Specification

-

Test Complete.

Maintenance > Tune-up and Engine Performance Checks > Fuel Pressure > System Information > System Diagnosis > Fuel Delivery Check > Page 1827

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