F 350 4WD Super Duty V8-6.4L DSL Turbo (2008)
Diesel MFI Pump: Description and Operation
Fuel Pressure Control Valve
Fuel Pressure Control Valve
Fuel Pressure Control Valve
The PCM controls the fuel rail pressure (FRP) by activating the fuel pressure control valve which regulates the fuel pressure at the outlet of the high
pressure fuel injection pump. The PCM regulates FRP by controlling the on/off time of the fuel pressure control valve solenoid. An increase or
decrease in the on/off time positions maintains pressure in the fuel system or vents pressure to the fuel cooler. A high duty cycle indicates a high FRP
is being commanded. A low duty cycle indicates less pressure is being commanded. The fuel pressure control valve is mounted on the top rear of the
engine in the high pressure fuel injection pump cover and is integrated to the high pressure fuel injection pump.
Fuel Volume Control Valve
Fuel Volume Control Valve
The PCM controls the volume of low pressure fuel that enters the inlet one-way check valve and 3 main pump pistons by activating the fuel volume
control valve. The PCM regulates fuel volume by controlling the on/off time of the fuel volume control valve solenoid. A high duty cycle indicates a
high fuel volume is being commanded. A low duty cycle indicates less volume is being commanded. The fuel volume control valve is mounted on the
top rear of the engine in the high pressure fuel injection pump cover and is integrated to the high pressure fuel injection pump.
