SELVA MARINE Blue Whale 250 EFI Service Manual page 28

GEN
INFO
Electronic fuel injection system diagram
Fuel flows through the fuel filter in the water separator and the low-pressure fuel pump sends the
fuel through the fuel filter and is sent to the vapor separator tank. When the fuel in the vapor separa-
tor tank exceeds the specified volume, it returns to the low-pressure fuel pump via the fuel hose.
Fuel in the vapor separator tank that is pressurized by the high-pressure fuel pump is sent to the
port and starboard fuel rails and is injected from the fuel injectors into the combustion chambers.
When the fuel pressure exceeds the specified value, the fuel is sent back to the vapor separator
tank from the pressure regulator via the fuel cooler to maintain the specified fuel pressure.
When the engine is turned off and when the engine is cranked, the vapor shut-off valve closes to
prevent the fuel vapor gas from entering the surge tank. After the engine is started, the vapor shut-
off valve opens and closes repeatedly to control the fuel vapor gas volume that enters the surge
tank.
When the vapor shut-off valve is closed, the fuel vapor gas is adsorbed by the activated carbon in
the canister and some is released into the atmosphere.
Primer pump
Fuel filter with water separator
Check valve
Low-pressure fuel pump
Filter
Vapor
Separator tank
Fuel rail (STBD)
Injector
#1
Combustion Combustion
chamber #1
Intake manifold (STBD)
Air
:
: Fuel
: Vapor gas
1-23
General information
Canister
High-pressure fuel pump
Injector Injector
#3 #5
Combustion
chamber #3 chamber #5
Inboard fuel filter (optional)
Check valve
Intake silencer
Check valve
Atmosphere
Fuel cooler
Fuel rail (PORT)
Injector Injector
#6 #4
Combustion Combustion
chamber #6 chamber #4
Intake manifold (PORT)
Boat fuel tank
Vapor shut-off valve
Surge tank
Pressure regulator
Injector
#2
Combustion
chamber #2
S6P21116
6P23H11