| 20110155102 | DIRECT INJECTION BI-FUEL SYSTEM FOR COMBUSTION ENGINES - A direct injection bi-fuel system includes a first fuel subsystem, a second fuel subsystem, and a junction configured to receive first fuel from the first fuel subsystem when the system is operating in a first fuel consuming mode, and to receive second fuel from the second fuel subsystem when the system is operating in a second fuel consuming mode. A pump is configured to receive the fuel passing through the junction and pump the fuel to a high pressure rail of a combustion engine, and a purging unit is configured to purge the second fuel from the rail when the system is switched from the second fuel consuming mode to the first fuel consuming mode. The purging unit includes a piston and is configured to receive the second fuel on one side of the piston and the first fuel on the other side of the piston. | 06-30-2011 |
