Evinrude E-tec 75 HP Service Manual page 159

The vapor separator is serviced as an assembly
and includes the fuel circulation pump.
1
Vapor Separator Assembly
1. 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 water cavity of the sepa-
rator self-drains when the outboard is stored verti-
cally. Refer to HOSE ROUTING AND WATER
FLOW DIAGRAM on p. 192.
Venting
The fuel vapor vent regulates fuel vapor pressure
in the fuel system.
1
005006
1. Vent
1. Vent hose
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.
FUEL SYSTEM
COMPONENTS
005007
1
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