120
SYSTEM ANALYSIS
FUEL INJECTOR OPERATION
Vapor Separator Checks
Fuel Supply
The vapor separator must provide “solid” fuel to
the fuel circulation pump. Make sure the vapor
separator receives the proper fuel supply from the
fuel lift pump.
Perform
Lift Pump Pressure Test
on p. 166.
•
Use primer to check fuel movement through fuel
lift pump.
•
Outboard runs: Check pressure with outboard
running.
•
Outboard does not run: Check pressure with
outboard cranking.
Venting
Monitor the vapor separator vent hose. No fuel or
a trace of fuel is acceptable. Excessive fuel dis-
charge indicates a vapor separator vent malfunc-
tion. Monitor vent for presence of fuel during
testing. Temporarily install clear tubing for moni-
toring. Replace vapor separator if the venting of
fuel is continuous.
Fuel Delivery to Lift Pump
Perform the
Lift Pump Vacuum Test
on p. 167.
Make sure no restrictions or air leaks exist in the
fuel supply hose or boat fuel system.
FUEL INJECTOR
OPERATION
Neutral Switch
The powerhead mounted neutral switch provides
a ground signal for the
EMM
to indicate shift link-
age position. The engine
Monitor
screen of the
diagnostic program provides a display which indi-
cates switch position, NEUTRAL or IN GEAR.
Make sure switch is operating properly. Refer to
Neutral Switch
on p. 90.
Static Tests
Perform the
Fuel Injector Static Test
using the
diagnostic program. Static tests are performed
with the outboard “static” or not running. Listen for
an audible “click” from each injector when it is
actuated.
IMPORTANT:
Battery must be fully charged and
connections must be clean and tight.
Results:
No injectors actuate:
•
Use the diagnostic software to monitor 55 V out-
put. Check individual injector circuits from
EMM
to injectors. Check alternator 55 V input to
EMM.
See
Stator Voltage Output Test
on
p. 129.
Some injectors actuate; some do not:
•
Make sure individual injector circuits and injec-
tors are functional. See
Injectors
on p. 164.
All injectors actuate:
•
Confirm fuel system pressure and fuel supply to
injectors.
Содержание E-tec 75 HP
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