C 2500 Truck 2WD V8-305 5.0L (1990)
Fuel Pressure Regulator: Description and Operation
IAC Valve Operation And Fuel Pressure Regulation
The pressure regulator is a diaphragm-operated relief valve with system operating pressure on one side and and atmospheric pressure on the other side.
The function of the regulator is to maintain a constant pressure to the injectors at all times, by controlling the flow in the return line by means of a
calibrated bypass.
NOTE: The pressure regulator on this unit is serviced as part of the fuel meter cover and should not be disassembled.