Fuel Pressure Control Solenoid: Description and Operation

Exhaust Gas Recirculation Solenoid Vacuum Valve:

PURPOSE

The Fuel Pressure Regulator Control (FPRC) adjusts the amount of vacuum applied to the Fuel Pressure Regulator. This is done to enrichen the fuel mixture for prevention of fuel percolation on hot starts and allows more fuel for starting.

OPERATION

During hot starting, the PRCV cuts off manifold vacuum to the fuel pressure regulator. This permits an increase in fuel pressure resulting in more fuel for starting. After the engine is started, vacuum is returned to the pressure regulator and fuel pressure is lowered to regular operating pressure.

NOTE: Pressure in the Fuel Injection Manifold increase as engine vacuum drops and decreases when manifold vacuum is high.