Fuel Pressure Control Solenoid: Description and Operation

Fuel Pressure Regulator Control Solenoid:

The fuel pressure regulator control solenoid valve controls the vacuum to the fuel pressure regulator. This valve prevents percolation of the fuel during idle, or after the engine is started at normal operating temperature. Vacuum is restricted after the engine is restarted, or allowed to idle for approximately two minutes with the coolant temperature above 70°C (158°F) and/or the intake air temperature above 20°C (68°F). This in turn increases the fuel pressure.

To prevent vapor-lock during hot restart idle, vacuum to the fuel pressure regulator is momentarily cut and fuel injection pressure is increased to slightly more than 280 kPa (41 psi).