Circuit/System Verification

NOTE:

Inspect the fuel system for damage or external leaks before proceeding.
Verify that adequate fuel is in the fuel tank before proceeding.
The fuel pump relay may need to be commanded ON a few times in order to obtain the highest possible fuel pressure.
DO NOT start the engine.

Ignition ON, command the fuel pump relay ON with a scan tool. You should hear the fuel pump turn ON and OFF for 3-5 seconds.
- If the fuel pump does not operate, refer to Fuel Pump Electrical Circuit Diagnosis .
Ignition OFF, all accessories OFF, install the J 37287 and CH-48027 . See Special Tools . Refer to Fuel Pressure Gage Installation and Removal .
Ignition ON, command the fuel pump relay ON with a scan tool. Verify the fuel pressure is between 380-410 kPa (55-60 psi) and remains steady for 5 minutes.
Operate the vehicle within the conditions of the customers concern while monitoring fuel related parameters with a scan tool.
- If the scan tool parameters do not indicate a lean condition, refer to Symptoms - Engine Controls .