Circuit/System Testing

WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

Fuel Pressure Low

Verify the following conditions do not exist:
- Poor component electrical connections: Fuel Pump - Chassis Ground
- Poor component electrical connections: Fuel Pump - Electrical Connector
- Fuel Feed Pipe - Leaking / Restricted / Visible Damage
- If a condition exists
  Repair as necessary
- Go to next step: If no conditions exist
Test or replace the component: G12 Fuel Pump

Fuel Pressure Leaks Down

Ignition/Vehicle - Off
Relieve the fuel system pressure. - Refer to: Fuel Pressure Relief
Install the special tool: EN-37287 Fuel Line Shut-Off Adapter @ Fuel Feed Pipe
Open the valve on the tool: EN-37287 Fuel Line Shut-Off Adapter
Ignition - On / Vehicle - In Service Mode & Engine - Off
Perform the scan tool control function: Fuel Pump Enable - On and Off
Close the valve on the tool: EN-37287 Fuel Line Shut-Off Adapter
Verify the scan tool parameter: Fuel Pressure Sensor = Pressure drops less than 34 kPa (5 PSI) within 1 min.
- If the pressure drops 34 kPa (5 PSI) or greater
  Locate and replace the leaking component: Q17 Fuel Injector
- Go to next step: If the pressure drops less than 34 kPa (5 PSI)
Test or replace the component: G12 Fuel Pump

Fuel Pressure Drops Off

Verify the condition does not exist:
- Poor component electrical connections: Fuel Pump - Chassis Ground
- Poor component electrical connections: Fuel Pump - Electrical Connector
- Fuel Feed Pipe - Leaking/Restricted/Visible Damage
- If a condition exists
  Repair as necessary
- Go to next step: If no conditions exist
Test or replace the component: G12 Fuel Pump