TOHATSU BFT75A Service Manual page 116

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5. Fuel Pump (High pressure side) Inspection
You should hear the pump hum when the combination switch is turned "ON".
Is the hum heard?
YES
NO
6. Fuel Flow Inspection
Inspect the fuel flow (page 5-99)
Is the fuel flow within specification?
YES
NO
7. Spark plug inspection
Remove and inspect the spark plugs.
Is the spark plug wet?
YES
NO
8. Cylinder Compression
Check the cylinder compression (page 14-32).
Is the compression normal?
YES
NO
9. Fuel injector inspection
Inspect the fuel injector (page 5-103)
Is the fuel injector normal?
YES
NO
10. Ignition system inspection
Check the ignition system (page 8-3).
Is the ignition system normal?
YES
NO
– GO TO STEP 6.
– Perform fuel pump system (High pressure side) inspection (page 5-99).
– GO TO STEP 7.
– • Clogged fuel feed hose
• Clogged fuel strainer (High pressure side)
• Pressure regulator malfunction (page 5-98)
• Faulty fuel pump (High pressure side)
– • Incorrect spark plug heat range
• Incorrect spark plug gap
• Clogged between the silencer and cylinder head
• Improper vapor separator float height
– GO TO STEP 8.
– GO TO STEP 9.
– • Improper valve clearance
• Valve stuck open
• Worn cylinder and piston rings
• Damaged cylinder head gasket
• Seized valve
• Improper cam chain adjustment
– GO TO STEP 10.
– • Repair the open or short circuit in the fuel injector wire
• Faulty fuel injector
– GO TO STEP 11.
– Faulty ignition system.
TROUBLESHOOTING
4-3