Patent ID: 8602010

Claim:
A fuel supply system configured to supply a first fuel which is separated from a raw fuel and containing components with a higher octane number compared to the raw fuel, and the raw fuel or a second fuel which is separated from the raw fuel and containing components with a lower octane number compared to the raw fuel, selectively or by a specified mixing ratio to an internal combustion engine at the same time, comprising: a raw fuel tank configured to store the raw fuel; a separation device configured to separate the raw fuel supplied from the raw fuel tank to the first fuel and the second fuel; a condenser configured to condense the first fuel separated by the separation device; a first fuel tank configured to store the first fuel condensed by the condenser; a vacuum pump configured to suction an evaporation fuel generated by an evaporation of the first fuel from the condenser, and configured to provide the evaporation fuel to the first fuel tank; a controller configured to control an operation of the vacuum pump; and a pressure sensor configured to measure an internal atmospheric pressure of the condenser.