Yamaha F50F Service Manual page 285

Good condition?
Yes
Check the fuel rail for leaks or
damage.
Good condition?
Yes
Check the fuel filters for clogs,
dirt, or water and the hoses for
leaks.
Good condition?
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 ignition system and
compression pressure.
6C13G11
No
Replace the pressure regulator.
No
Replace the fuel rail.
Yes
Repair, clean, or replace the
defective parts.
Yes
Replace the diaphragm.
Yes
Replace the needle valve.
Power unit
1
2
3
4
5
6
7
8
9
9-12