Patent ID: 8151770

Claim:
An engine fuel supply system comprising a cylinder fuel supply passage for supplying fuel into an engine cylinder by a fuel pump, and an exhaust-pipe fuel supply passage for supplying fuel into an engine exhaust pipe, the engine fuel supply system being characterized by comprising: a dual-purpose pump provided separately from the fuel pump to serve both for air removal from the cylinder fuel supply passage and for fuel supply into the exhaust pipe; an air-removal fuel supply passage that communicates a discharge port of the dual-purpose pump with the cylinder fuel supply passage; the exhaust-pipe fuel supply passage that communicates the discharge port of the dual-purpose pump with the exhaust pipe; a first on-off valve provided on the air-removal fuel supply passage for opening/closing the air-removal fuel supply passage; a second on-off valve provided on the exhaust-pipe fuel supply passage for opening/closing the exhaust-pipe fuel supply passage; and control means which, when a signal is generated to command air removal from the cylinder fuel supply passage, activates the dual-purpose pump, causes the first on-off valve to assume an open state, and causes the second on-off valve to assume a close state, so that the fuel is supplied from the dual-purpose pump to the cylinder fuel supply passage via the air-removal fuel supply passage, and which, when a signal is generated to command fuel supply into the exhaust pipe, activates the dual-purpose pump, causes the second on-off valve to assume the open state, and causes the first on-off valve to assume the close state, so that the fuel is supplied from the dual-purpose pump to the exhaust pipe via the exhaust-pipe fuel supply passage.