Fuel Delivery System Components - Suzuki DF150 Service Manual

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 hoses.
Fuel is supplied through the primer bulb, low pressure fuel filter, and low pressure fuel 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. 250 kPa
(2.55 kg/cm , 36.3 psi), the valve in the fuel pressure regulator will open and return the excess fuel to the
2
vapor separator chamber.
Pressurized fuel enters into the intake ports through the fuel injector based on the sequential signals sup-
plied from the ECM.
Low pressure
fuel pump
Low pressure
fuel filter
Fuel pressure regulator
Intake silencer
Throttle body
Primer bulb
To crankcase
Fuel vapor separator
Intake manifold
ENGINE CONTROL SYSTEM
Fuel tank
High pressure fuel pump
High pressure fuel filter
!
Fuel cooler
"
Fuel delivery pipe
#
Fuel injector
$
Evaporation hose
3-21