Yamaha F150A Service Manual page 294

TRBL
SHTG
Clogs or leaks?
No
Check the fuel pump
diaphragm.
Cracks or damage?
No
Check the vapor separator
needle valve.
Is the needle valve
bent or worn?
No
Check the injector resistance
and check the injectors for
clogs.
Good condition?
Yes
Check the starting system or
the ignition system.
9-9
Troubleshooting
Yes
Repair or replace the defective
parts.
Yes
Replace the diaphragm.
Yes
Replace the needle valve.
No
Replace the injectors.
63P3F11