Fuel Delivery System Components - BOMBARDIER Johnson 90 Service Manual

ENGINE CONTROL SYSTEM
ELECTRONIC FUEL INJECTION SYSTEM
Fuel Delivery System Components
The fuel delivery system is composed of the low pressure líne 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 ata constant level, is higher than the pressure in the vapor separator cham­
ber.
When fuel feed line pressure exceeds vapor separator chamber pressure by more than approx. 255 kPa
(2.55 kg/cm
2 ,
36.3 psi), the valva 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
supplied from the ECM.
Primerbulb
- ; c()J ~
Low pressure
fuel filter
Low pressure
fuel pump
r
-
Fuel tank
Fuelvapor
separator
Evaporation hose
Fuel pressure
regulator
Breather hose 1
Silencer -H
G)
High pressure fuel pump
®
High pressure fuel filter
@ Fuel retum pipe
©
Fuel delivery pipe
®
Fuel injector
Throttle body
3-15