Evinrude E-tec 75 HP, Service Manual

Page: 158 / 344

158
FUEL SYSTEM
COMPONENTS
COMPONENTS
The
Evinrude E-TEC
direct injection system con-
sists of the following components:
•
Fuel Lift Pump
•
Fuel Filter
•
Vapor Separator
•
Fuel Circulation Pump
•
Fuel Supply Manifolds
•
Fuel Return Manifolds
•
Fuel Injectors
Fuel Lift Pump
The fuel lift pump is a mechanical, pressure-pulse
pump. The diaphragm of the pump is driven by a
pulse hose that connects to the number 3 cylinder
of the cylinder/crankcase assembly.
Vacuum from the fuel lift pump pulls fuel from the
fuel tank. Once fuel reaches the pump, internal
pump pressure forces the fuel from the pump
through the fuel filter and into the vapor separator.
IMPORTANT:
The oil injector supplies oil to the
outboard's incoming fuel supply. A limited amount
of oil is injected into the fuel supply to clean injec-
tors and reduce internal fuel system deposits.
Refer to
Oil Supply and Distribution Diagram
on p. 182.
Fuel Filter
The in-line filter protects the vapor separator and
the high-pressure components of the fuel system
from water and contaminants. Refer to
INSPEC-
TION AND MAINTENANCE SCHEDULE on p. 72
for service frequency.
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; and
•
Contains a fuel pressure regulator for the high
pressure fuel system.
1. Fuel lift pump
005005
1. Pulse hose
002314
1
1
1. Filter
004968
1