Fuel Delivery System Components - Suzuki DF 90 Service Manual

3-16 ENGINE CONTROL SYSTEM

FUEL DELIVERY SYSTEM COMPONENTS

The fuel delivery system is composed of the low pressure 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 hoses.
Fuel is supplied through the primer bulb, low pressure fuel filter, and low pressure pump to the fuel vapor
separator.
Fuel 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 injectors.
The pressure regulator maintains fuel pressure in the feed line between the high pressure fuel pump and fuel
injector.
This pressure, maintained at a constant level, is higher than the pressure in the vapor separator chamber.
When fuel feed line pressure exceeds vapor separator chamber pressure by more than approx. 255 kPa (2.55
2 , 36.3 psi.), the valve in the fuel pressure regulator will open and return the excess fuel to the vapor
kg/cm
separator chamber.
Pressurized fuel enters into the intake ports through the fuel injector based on the sequential signals supplied
from the ECM.
Low pressure
fuel filter
Low pressure
fuel pump
Fuel vapor
separator
Fuel pressure
regulator
Breather hose
Silencer
Primer bulb
Throttle body
Fuel tank
Evaporation hose
Intake manifold
High pressure fuel pump
High pressure fuel filter
Fuel return pipe
Fuel delivery pipe
Fuel injector