Evinrude & Johnson E75DPLSCB, Service Manual

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FUEL SYSTEM
COMPONENTS
Fuel Manifolds
The fuel supply and return manifolds route fuel
through the high pressure side of the fuel system.
Fuel Supply Manifold
The fuel supply manifold supplies pressurized fuel
to the inlet port of each fuel injector.
Fuel Return Manifold
The fuel return manifold provides a route for fuel
passing through the fuel injectors to flow back to
the fuel chamber of the vapor separator.
Fuel Injectors
Fuel injectors are fuel metering, electric solenoids
(55 V) bolted directly to the cylinder head. The
EMM controls the activation of each injector by
rapidly connecting and disconnecting the injec-
tor’s internal coil to ground.
Fuel Flow Compensation
The flow rate of each injector is measured as part
of the manufacturing process. This information is
recorded and assigned to the injector by serial
number.
Then, the EMM is programmed to compensate for
variations in fuel flow. Each injector and its loca-
tion on the outboard is identified by the
EMM . DO
NOT install an injector without updating the com-
pensation software.
Each service injector includes its fuel flow infor-
mation on a 3.5 in. floppy disk. This software
allows the
EMM to be reprogrammed for this injec-
tor’s unique fuel flow characteristics.
IMPORTANT:
Fuel injectors MUST NOT be
moved from one cylinder to another. EMM pro-
gramming is associated with the cylinder location
of each injector. Installing an injector on the wrong
cylinder can result in powerhead failure.
Injector Fuel Supply
Fuel is supplied to the injectors by the fuel circula-
tion pump and the fuel supply manifold.
Each injector has internal fuel passages. These
passages are designed to:
•
Provide fuel to the injector's injection chamber
•
Route fuel through the injector housing to cool
the injector coil and armature
1. Fuel supply
2. Fuel return
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