Grand Voyager AWD V6-201 3.3L (1992)
Fuel Pressure Regulator: Description and Operation
Fuel Pressure Regulator
The fuel pressure regulator is used to maintain a constant pressure of 53 psi in the fuel supply system. The pressure regulator uses a vacuum assisted
spring loaded diaphragm to control the fuel return port in order to maintain constant pressure. Pressurized fuel is delivered to the fuel rail and then flows
through the injectors or the pressure regulator. When fuel pressure acting on the regulator diaphragm exceeds 53 psi, the regulator spring is compressed
and the fuel return port is opened. When fuel pressure drops below 53 psi, spring tension causes the diaphragm to block the fuel return port. As
manifold vacuum increases during deceleration, less pressure is needed to supply the same amount of fuel into the air flow. In order to fine tune the fuel
pressure under all operating conditions, the vacuum assists in opening the fuel port during high vacuum conditions.
