| 主权项 |
1. A method for a vehicle fuel delivery system comprising an internal combustion engine, the internal combustion engine having at least one cylinder having a piston, the internal combustion engine further having valved fuel injectors comprising:
opening a first solenoid valve positioned downstream of a first fuel pump and upstream of a port of a fuel rail, closing a second solenoid valve positioned downstream of an ejector and upstream of a first tank, adjusting a state of a third three-way solenoid valve positioned upstream of the port of the fuel rail, downstream of the first fuel pump, and downstream of a second fuel pump to direct a first fuel from the first tank to the port of the fuel rail via a passage in a first direction during a first mode, the first pump operating and the second pump not operating during the first mode; closing the first and second valves and adjusting the state of the third valve to direct a second fuel from a second tank to the port of the fuel rail via the passage in the first direction during a second mode, the second pump operating and the first pump not operating during the second mode; and closing the first valve, opening the second valve, and adjusting the state of the third valve to direct whichever fuel is in the fuel rail from the port of the fuel rail via the passage in a second direction, opposite the first direction, to the first tank during a vehicle shut-off condition, the first pump operating and the second pump not operating during the vehicle shut-off condition. |
