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168
FUEL SYSTEM
COMPONENTS
Fuel Reservoir
The vapor separator accumulates fuel in an inter-
nal fuel reservoir and supplies fuel to the electric
circulation pump. It is water-cooled to enhance
vapor separating capabilities.
Cooling
Water is used to cool the fuel as it flows through
the vapor separator. The cooling passage of the
separator self-drains when the outboard is stored
vertically. Refer to
Venting
The fuel vapor vent regulates fuel vapor pressure
in the reservoir.
The vapor separator vent is opened and closed by
a float valve. The float valve moves relative to the
fuel level in the fuel chamber. Hot fuel causes an
increase in vapor pressure. This results in a lower
fuel level in the vapor separator. The float valve
drops and the vent opens. This allows fuel vapor
to flow to the intake manifold through the vent
hose.
As the vapor pressure in the vapor separator
decreases, the fuel level begins to increase. An
increase in the fuel level raises the float valve and
the vent closes.
Pressure Regulator
The fuel pressure regulator helps maintain consis-
tent fuel pressure in the fuel system.
Fuel returning from the injectors enters the fuel
chamber of the vapor separator through a pres-
sure regulator. The pressure regulator maintains
approximately 20 to 30 psi (138 to 207 kPa) of fuel
pressure in the high pressure side of the fuel sys-
tem.
Fuel Circulation Pump
The fuel circulation pump is an electric high pres-
sure fuel pump.
Fuel Supply
The pump is mounted to the vapor separator and
draws fuel from the fuel chamber. It pumps pres-
surized fuel through a fuel supply manifold con-
nected to the fuel injectors.
Electrical Circuit
The circulation pump is controlled by the
EMM
and operates on the 12 V circuit. The circulation
pump is activated momentarily when the
EMM
powers up. The
EMM
controls pump operation by
rapidly connecting and disconnecting the pump’s
internal coil to ground.
1.
Vent
004187
1.
Vent hose connection to intake
004188
1
1
005024
Содержание E250DHLSCS
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Страница 186: ...184 FUEL SYSTEM NOTES NOTES Technician s Notes Related Documents Bulletins Instruction Sheets Other...
Страница 191: ...OILING SYSTEM OIL SUPPLY DIAGRAMS V6 189 9 006870 Rear View 6 4 5 3 Top View 1 2...
Страница 192: ...190 OILING SYSTEM OIL RECIRCULATION DIAGRAMS V6 OIL RECIRCULATION DIAGRAMS V6 004111a 2 4 6 1 3 5...
Страница 212: ...210 COOLING SYSTEM NOTES NOTES Technician s Notes Related Documents Bulletins Instruction Sheets Other...
Страница 216: ...214 POWERHEAD SERVICE CHART Taper Pin Tool Hole for Storage Scale FULL SIZE...
Страница 242: ...240 POWERHEAD POWERHEAD VIEWS POWERHEAD VIEWS Port Hose Routings 006972...
Страница 243: ...POWERHEAD POWERHEAD VIEWS 241 11 Starboard Hose Routings 006952...
Страница 244: ...242 POWERHEAD POWERHEAD VIEWS Port 006993...
Страница 245: ...POWERHEAD POWERHEAD VIEWS 243 11 Starboard 006973...
Страница 246: ...244 POWERHEAD POWERHEAD VIEWS Front 006974...
Страница 247: ...POWERHEAD POWERHEAD VIEWS 245 11 Rear 006975...
Страница 248: ...246 POWERHEAD POWERHEAD VIEWS Top 006957...
Страница 252: ...250 MIDSECTION SERVICE CHART 004117...
Страница 314: ...312 GEARCASE COUNTER ROTATION NOTES NOTES Technician s Notes Related Documents Bulletins Instruction Sheets Other...
Страница 346: ...344 TRIM AND TILT NOTES NOTES Technician s Notes Related Documents Bulletins Instruction Sheets Other...
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Страница 387: ...A B C 5 1 2 3 6 4 5 1 2 3 6 4 5 1 2 3 6 4 DRC6165R MWS Instrument Wiring Harness 1 2 5 1 2 3 6 7 4 8 A B C...
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