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.
- Before proceeding with this test, review the User Manual CH 48027-5 for Safety Information and Instructions.
- Ignition ON, engine OFF, 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 Pump Electrical Circuit Diagnosis .
- Ignition OFF, all accessories OFF, install a CH-48027: Gage. Refer to Fuel Pressure Gauge Installation and Removal (with CH 48027) .
- Ignition ON, engine OFF, command the fuel pump relay ON with a scan tool. Verify the fuel pressure is between 395-464 kPa (57-67 psi) and does not decrease greater than 34 kPa (5 psi) in 1 minute.