| CPC F02M 21/0245 (2013.01) [F02B 37/10 (2013.01); F02B 37/18 (2013.01); F02M 21/0248 (2013.01); F04B 43/00 (2013.01)] | 18 Claims |

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1. A system, comprising:
a first turbine positioned in an exhaust passage of an engine;
a second turbine positioned downstream of the first turbine in the exhaust passage;
a first compressor coupled to the first turbine and positioned in a gaseous fuel line upstream of the engine; and
a second compressor coupled to the second turbine and positioned in an intake passage of the engine.
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