2006-2010 Suzuki DF150 / DF175 4-Stroke Outboards Service Manual, Page 79Get this manual
ENGINE CONTROL SYSTEM
FUEL DELIVERY SYSTEM COMPONENTS
The fuel delivery system is composed of the low pressure fuel line components (fuel tank, filter, pump etc, fuel vapor separator, high pressure fuel pump, high pressure fuel filter, fuel pressure regulator (located in the fuel vapor separator), delivery pipe, fuel injector and hosesFuel is supplied through the primer bulb, low pressure fuel filter, and low pressure fuel 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 pipe to the fuel injectorsThe pressure regulator maintains fuel pressure in the feed line between the high pressure fuel pump and fuel injectorThis pressure, maintained 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 approx250 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 ECMLow pressure fuel filter Primer bulb