Roadmaster Estate Wagon V8-350 5.7L (1993)
The pressure regulator is a diaphragm-operated relief valve with engine vacuum 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.