1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 70Get this manual
3-15 ENGINE CONTROL SYSTEM
FUEL DELIVERY SYSTEM COMPONENTS
The fuel delivery system is composed of the low pressure line components (fuel tank, filterpump etc, fuel vapor separator, high pressure fuel pump, high pressure fuel filter, fuel pressure regulator (located in the fuel vapor separator), fuel injector and hosesFuel is supplied through the primer bulb, low pressure fuel filter, and low pressure pump to the fuel vapor separatorFuel flow from the fuel vapor separator is pressurized by the high pressure fuel pump and supplied through the high pressure fuel filter and fuel delivery gallery to the fuel injectorsThe pressure regulator maintains fuel pressure in the feed line between the high pressure fuel pump and fuel injectorThis pressuremaintained at constant level, is higher than the pressure in the vapor separator chamberWhen fuel feed line pressure exceeds vapor separator chamber pressure by more than approx255 kPa (2.55 kgcm2, 36.3 psi, the valve in the fuel pressure regulator will open and return the excess fuel to the vapor separator chamberPressurized fuel enters into the intake ports through the fuel injector based on the sequential signals supplied from the ECM