SELVA MARINE Blue Whale 250 EFI, Service Manual

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GEN
INFO
General information
1-23
6P23H11
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.
S6P21116
:
:
:
Primer pump Inboard fuel filter (optional) Boat fuel tank
Fuel filter with water separator
Check valve
Low-pressure fuel pump
Check valve
Check valve
Intake silencer
Atmosphere
Canister
Filter
Vapor
Separator tank
High-pressure fuel pump
Fuel cooler
Vapor shut-off valve
Surge tank
Pressure regulator
Fuel rail (STBD) Fuel rail (PORT)
Injector
#1
Injector
#3
Injector
#5
Injector
#6
Injector
#4
Injector
#2
Combustion
chamber #1 Combustion
chamber #3 Combustion
chamber #5 Combustion
chamber #6 Combustion
chamber #4 Combustion
chamber #2
Intake manifold (STBD) Intake manifold (PORT)
Air
Fuel
Vapor gas