Fuel Delivery System Components - Suzuki DF 40 Service Manual

3-15 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), 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 gallery 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. 250 kPa
(2.55 kg/cm 2 , 36.3 psi.), the valve in the fuel pressure regulator will open and return the excess fuel to the
vapor separator chamber.
Pressurized fuel enters into the intake ports through the fuel injector based on the sequential signals sup-
plied from the ECM.
Fuel tank
Exhaust
manifold
Primer bulb
High
pressure High
fuel pressure
fuel pump
filter
Breather
hose
Delivery
gallery
Fuel injector
Intake
manifold
Throttle body
Fuel
vapor
separator
Evaporation
hose
Fuel
pressure
regulator
Silencer
Low pressure
fuel filter
Low pressure
fuel pump