BF135A•BF150A
5-96
9. FUEL SUPPLY SYSTEM
• Troubleshooting
When the MIL does not come ON but an engine failure of
either of the following symptoms occurs at the engine start
or during idling, inspect the system(s) and part(s) in the
numbered sequence.
Low pressure fuel supply system
• Hard to start
1. Water separator (P. 3-19)
2. Fuel strainer (low pressure side) (P. 3-15)
3. Fuel line (low pressure side) (P. 5-104)
4. Vapor separator (P. 5-111 thru. 5-127)
• Engine starts but stalls soon.
1. Water separator (P. 3-19)
2. Fuel strainer (low pressure side) (P. 3-15)
3. Fuel line (low pressure side) (P. 5-104)
4. Vapor separator (P. 5-111 thru. 5-127)
• Engine speed is not stable during idling and
trolling, or engine stalls.
1. Water separator (P. 3-19)
2. Fuel strainer (low pressure side) (P. 3-15)
• Engine sometimes misfires or tends to stall.
1. Water separator (P. 3-19)
2. Fuel strainer (low pressure side) (P. 3-15)
3. Fuel line (low pressure side) (P. 5-104)
4. Fuel pump (low pressure side) (P. 5-142)
• Engine tends to stall at hot restart of the
engine.
1. Vapor separator (P. 5-111 thru. 5-127)
High pressure fuel supply system
• Hard to start
1. Fuel line (high pressure side) (P. 5-104)
2. Fuel pump (high pressure side) (P. 5-107)
• Engine starts but stalls soon.
1. Fuel line (high pressure side) (P. 5-104)
3. Pressure regulator (P. 5-106)
• Engine speed is not stable during idling and
trolling, or engine stalls.
1. Fuel line (high pressure side) (P. 5-104)
3. Pressure regulator (P. 5-106)
• Engine speed does not increase
1. Fuel line (high pressure side) (P. 5-104)
2. Pressure regulator (P. 5-106)
3. Fuel pump (high pressure side) (P. 5-107)
4. Fuel strainer (high pressure side) (P. 3-18)
• Engine sometimes misfires or tends to stall.
1. Water separator (P. 3-19)