Patent ID: 7770561

Claim:
An internal combustion engine, comprising: a low-pressure fuel feed system that feeds a low-pressure fuel pressurized by a low-pressure pump to a low-pressure fuel volume chamber through a low-pressure fuel passage; a low-pressure fuel injection device provided on the low-pressure fuel volume chamber for injecting the low-pressure fuel to an intake port; a high-pressure fuel feed system that feeds a high-pressure fuel to a high-pressure fuel volume chamber through a high-pressure fuel passage, said high-pressure fuel feed system including a high-pressure pump that raises the pressure of the low-pressure fuel pressurized by the low-pressure pump to provide the high-pressure fuel; a bypass passage that communicates the low-pressure fuel volume chamber with the high-pressure fuel feed system; and a check valve provided in the bypass passage for preventing flow of the fuel from the high-pressure fuel feed system to the low-pressure fuel volume chamber, wherein the bypass passage communicates the low-pressure fuel volume chamber with the high-pressure fuel passage and a valve-opening pressure of the check valve at which the check valve opens to allow flow of the fuel from the low-pressure fuel volume chamber to the high-pressure fuel feed system is set to be lower than a delivery pressure of the low-pressure fuel at which the low-pressure fuel is delivered by the low-pressure pump.