132
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. 187.
• 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. 187.
Make sure no restrictions or air leaks exist in the
fuel supply hose or boat fuel system.
FUEL INJECTOR
OPERATION
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: This test is operating injector on
12 V battery power / system voltage (55 V). Bat-
tery must be fully charged and connections must
be clean and tight. The start assist circuit (SAC) of
the EMM should convert battery voltage (12 V) to
30 V of system voltage. Injector activation should
be carefully confirmed.
Results:
No injectors actuate:
• Use the diagnostic software to monitor system
voltage (55 V). Check individual injector circuits
from EMM to injectors. See Stator Voltage Out-
put Test on p. 142 if system voltage is low.
Some injectors actuate; some do not:
• Make sure individual injector circuits and injec-
tors are functional. See Fuel Injectors on
p. 184.
All injectors actuate:
• Confirm fuel system pressure and fuel supply to
injectors.
To Next Page
Loading...
Need help?
General
