176
FUEL SYSTEM
COMPONENTS
Vapor Separator
The vapor separator:
• Serves as a water-cooled fuel reservoir to accu-
mulate incoming fuel from the fuel lift pump and
from the fuel return manifold
• Contains a float controlling the venting of fuel
vapors
• Contains a fuel pressure regulator for the high
pressure fuel system.
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. 216.
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.
Vapor Separator Assembly
1. Circulation pump
005322
1
1. Vent 005323
1. Vent hose connection to intake 005326
1
1
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