Patent ID: 8302582

Claim:
A fuel supply device to supply fuel to an engine comprising: a fuel passage portion having a first passage to send supply fuel to the engine, and a second passage to communicate with the first passage; a first electric pump to send fuel into the first passage; a second electric pump to send fuel into the second passage; a relief valve to discharge fuel from the second passage when a fuel pressure of the second passage is higher than a predetermined relief pressure; a pressure regulator having a fuel chamber to communicate with the first passage, and a backpressure chamber to communicate with the second passage; and a controller to switch control mode of the first pump and the second pump between a low pressure mode and a high pressure mode based on an operation state of the engine, wherein the pressure regulator discharges fuel from the fuel chamber when a fuel pressure of the fuel chamber is higher than a regulation pressure in a state that a fuel pressure of the backpressure chamber is equal to the relief pressure, the regulation pressure being higher than the relief pressure, the controller controls the first pump to stop, and controls a pressure of fuel discharged from the second pump to become higher than the relief pressure, when the low pressure mode is selected, and the controller controls a pressure of fuel discharged from the first pump to become higher than the regulation pressure, and controls a pressure of fuel discharged from the second pump to become higher than the relief pressure, when the high pressure mode is selected.