NOVELTY - The fuel producing system using purification system comprises plasma reformer (100), separation system and internal combustion engine. The plasma reformer receives liquid feed (124) and produces gas stream (126) from liquid feed. The gas stream contains molecular hydrogen and carbon oxides. The separation system removes portion(s) of carbon oxides from gas stream to produce hydrogen enriched gas stream. The hydrogen enriched gas stream is provided as fuel for internal combustion engine which combust hydrogen enriched gas stream.    USE - System for producing fuel for internal combustion engine and fuel cell.    ADVANTAGE - The system produces fuel having minimal emission and improved flame velocity. The internal combustion engine using the fuel has improved ignition timing, higher compression ratio, leaner air-to-fuel mixture, increased thermal efficiency, mechanical efficiency and fuel economy.    DETAILED DESCRIPTION - The fuel producing system using purification system comprises plasma reformer, separation system and internal combustion engine. The plasma reformer receives liquid feed and produces gas stream from liquid feed. The gas stream contains molecular hydrogen and carbon oxides. The separation system connected with plasma reformer removes portion(s) of carbon oxides from gas stream to produce hydrogen enriched gas stream. An internal combustion engine is coupled to separation system. The hydrogen enriched gas stream is provided as fuel for internal combustion engine which combust hydrogen enriched gas stream. The liquid feed comprises mixture of ethanol and liquid oxygenated hydrocarbons (5 volume%, based on total volume of liquid feed). The carbon oxides comprise carbon monoxide and carbon dioxide. An INDEPENDENT CLAIM is included for method for producing fuel for internal combustion engine using separation system.    DESCRIPTION OF DRAWING(S) - The drawing shows structure of plasma reformer system.    Plasma reformer (100)    Gap (110)    Power supply (122)    Feed (124)    Gas stream (126)