178
FUEL SYSTEM
FUEL SYSTEM TESTS
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: The cylinder location of each
injector must always be maintained. EMM pro-
gramming is associated with the cylinder location
of each injector.
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
FUEL SYSTEM TESTS
Fuel System Pressure Test
Relieve fuel system pressure. See Relieving Fuel
System Pressure on p. 183.
After relieving fuel system pressure, install a 0 to
60 psi (0 to 415 kPa) Fuel Pressure Gauge,
P/N 5007100 or equivalent, to the upper fuel pres-
sure test fitting.
START outboard and check pressure. System
pressure should be 20 to 35 psi (138 to 241 kPa).
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WARNING
Use caution when working on any pres-
surized fuel system. Wear safety glasses
and work in a well ventilated area. Extin-
guish all smoking materials and make cer-
tain no open flames or ignition sources
exist. Before starting any fuel system ser-
vice, carefully relieve fuel system pres-
sure. Failure to properly relieve fuel
system pressure can result in spraying
fuel and/or excessive fuel spillage during
servicing. Fuel is flammable and can be
explosive under certain conditions.
WARNING
Protect against hazardous fuel spray.
Before starting any fuel system service,
carefully relieve fuel system pressure.
1. Fuel pressure gauge
2. Test fitting
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