137
FUEL SYSTEM
COMPONENTS
7
The vapor separator is serviced as an assembly
and includes the fuel circulation pump.
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 HOSE ROUTING AND WATER
FLOW DIAGRAMS on p. 178.
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 with 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.
Vapor Separator Assembly
1. Circulation pump
006555
1. Vent 005007
1. Vent hose connection to intake 002180
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