Circuit/System Verification

IMPORTANT:

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.

Ignition ON, command the fuel pump relay ON with a scan tool. You should hear the fuel pump turn ON and OFF.
- If the fuel pump does not operate, refer to Fuel System Diagnosis (w/o FPCM) or Fuel System Diagnosis (FPCM) .
Ignition OFF, all accessories OFF, install the CH-48027 . See Special Tools . Refer to Fuel Pressure Gauge Installation and Removal .
Ignition ON, command the fuel pump relay ON with a scan tool. Verify the fuel pressure is between 345-414 kPa (50-60 psi) and remains steady for 5 minutes.