Yamaha F50F Service Manual page 284

TRBL
SHTG
Fuel system
Check the electric fuel pump
operation.
Can the opera-
tion sound be
heard?
Yes
Check the fuel pressure.
Out of specification?
No
Check the vapor separator
pressure regulator.
Continued on next page.
9-11
Troubleshooting
No
Check the fuse and wiring har-
ness for continuity.
Check the main and fuel pump
relay (fuel control) for continuity.
Replace the electrical fuel
pump.
Check the resistance of each
Yes
injector and check the injectors
for clogs.
Check the ignition system and
compression pressure.
Is there continuity?
Yes
Is there continuity?
Yes
Good condition?
Yes
No Repair or replace
the defective parts.
No Replace the main
and fuel pump relay.
No Replace the injec-
tors.
6C13G11