Fuel Pressure Regulator Control System

Fuel Pressure Regulator Control Chart:

Fuel Pressure Regulator Control:

PURPOSE AND OPERATION
The fuel "pressure-up" control system briefly increases fuel pressure for improved starting performance of a hot engine. Under normal operating conditions, manifold vacuum is applied to the fuel pressure regulator. When starting the engine, however, the Engine Control Module allows current to flow through the ON/OFF solenoid valve in the control vacuum line, opening this line to the atmosphere. As a result, atmospheric pressure is applied, restricting the fuel return line so as to increase fuel pressure.