Monaco V6-182 3.0L SOHC (1990)
Fuel Pressure Regulator: Description and Operation
Fuel Pressure Regulator
The fuel pressure regulator is used to maintain a constant pressure differential at the fuel injector tip of 28-30 psi (193-207 kPa). The pressure regulator
uses a vacuum assisted spring loaded diaphragm to control the fuel return port in order to maintain constant pressure. When fuel pressure acting on the
regulator diaphragm exceeds 28-30 psi, the regulator spring is compressed and the fuel return port is opened. When fuel pressure drops below 28-30 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 manifold vacuum assists in opening the
fuel port during high vacuum conditions. If no vacuum is applied fuel pressure will be slightly higher.