BOMBARDIER Johnson 90 Service Manual page 77

ENGINE CONTROL SYSTEM
ELECTRONIC FUEL INJECTION SYSTEM
FUEL PRESSURE REGULATOR
The fuel pressure regulator is located in the fuel vapor separator. The regulator's function in the system
is to maintain a constant fuel pressure relative to the injector while the engine is operating. The regulator
diaphragm chamber is open to the fuel vapor separator chamber to keep the pressure balanced. Fuel
pressure, adjusted by the regulator, is constantly maintained higher than the pressure in the fuel vapor
separator chamber by approx. 255 kPa (2.55 kg/cm
2 ,
36.3 psi). Bypass fuel is returned back to the fuel
vapor separator chamber.
VALVE CLOSED
(below 255 kPa)
VALVE OPENED
(ovar 255 kPa)
00
00
to Fuel vapor
separator chamber
(Fuel return)
ÍJ
from Delivery llne
ÍJ
from Delivery llne
FUEL INJECTOR
The fuel injector is an electromagnetic valve operated by a
signa! from the ECM. When the injection signal is supplied to
the fuel injector, the solenoid coil is energized pulling up the
plunger. This opens the injector valve and injects fuel.
Because the fuel pressure is kept constant, the amount of fuel
injected is determined by the amount of time (duration) the
valve is open.
4
1. Filler
2. Solenoid coíl
3. Ball valve
4. Terminal
2
3-17