Pressure Regulator Control Solenoid

When the pressure regulator control solenoid is energized, vacuum to the fuel pressure regulator is blocked, causing fuel pressure to increase. ECM energizes the pressure regulator control solenoid for 30 seconds each time the vehicle is started. When coolant temperature is greater than 172°F (78°C) and engine speed is less than 2500 RPM or engine load is light, ECM will energize the pressure regulator control solenoid for up to 3 minutes. This improves hot engine start.