Yamaha F50A Service Manual page 131

Symptom: Engine can be started, but does not remain on.
• Check the fuel system.
• Check the ignition system.
• Check the compression pressure of power unit.
Check that the fuel vent screw of the fuel tank is open.
Is the vent
screw open?
Yes
Check for water or residue in
the fuel filter.
Water or resi-
due?
Yes
Clean the fuel system from the
fuel tank to the fuel filter.
62Y3A11
No
Open the fuel vent screw.
No
Check the fuel hose for kinks or
fuel leakage.
Kinks or fuel
leakage?
Yes
Replace the respective parts.
Check the carbure-
tors.
Troubleshooting
No
Check the primary
pump operation.
Yes
Good operat-
ing condition?
No
Replace the pri-
mary fuel pump.
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