Fuel Pressure Regulator: Description and Operation

TBI 220 Fuel Flow Diagram:

TBI 220 Air Flow Diagram:

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.