Evinrude E-Tec 40 HP Service Manual page 135

The vapor separator is serviced a s a n a ssembly
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 p ump. It is water-cooled to e nhance
vapor separating capabilities.
Cooling
Water is use d to cool the f uel as it flo ws through
the vapor sep arator. Th e cooling p assage of the
separator self-drains when the ou tboard is sto red
vertically. Refer to HOSE ROUTING AND WATER
FLOW DIAGRAMS on p. 174.
Venting
The fuel vapor vent regulates fuel vapor pressure
in the reservoir.
1. Vent
1. Vent hose connection to intake
The vapor separator vent is opened and closed by
006555
a float valve. The float valve move s with the fuel
level in the fu el chamb er. Hot fuel causes
increase in vapor pressure. This results in a lower
fuel le vel in th e va por sep arator. The float valve
drops and the vent opens. This allows fuel vapor
to flow t o the int ake manifold through the ve nt
hose.
As the vapor pressu re in the va por sep arator
decreases, the fuel level begins to in crease. 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 injecto rs ente rs the fue l
chamber o f t he vapor sep arator th rough a pres-
sure regu lator. The p ressure reg ulator ma intains
approximately 20 to 30 psi (138 to 207 kPa) of fuel
1
pressure in the high pressure side of the fuel sys-
tem.
005007
FUEL SYSTEM
COMPONENTS
1
002180
an
7
133