138
FUEL SYSTEM
COMPONENTS
Fuel Circulation Pump
The fuel circulation pump is an electric high pres-
sure fuel pump.
Fuel Supply
The pump is mounted to the vapor separator and
draws fuel from the fuel chamber. It pumps pres-
surized fuel through a fuel supply manifold con-
nected to the fuel injectors.
Electrical Circuit
The circulation pump is controlled by the EMM
and operates on the 55 V circuit. The outboard
must be cranking or running (CPS input to EMM)
for the circulation pump to be activated. The EMM
controls pump operation by rapidly connecting
and disconnecting the pump’s internal coil to
ground.
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.
1. Fuel pump electrical connector 006557
1. Fuel supply
2. Fuel return
006560
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