Fuel recovery system

A method of recovering gaseous fuel from a tank containing liquid fuel, comprising:

• collecting the gaseous fuel from the tank in an accumulator;
• compressing the gaseous fuel;
• separating the compressed gaseous fuel into a first flow of gaseous fuel at a first temperature and a second flow of gaseous fuel at a second temperature;
• and
• returning the second flow to the tank.

A machine comprising:

• a platform;
• a plurality of wheels configured to support the platform;
• a tank mounted on the platform and configured to store a liquid fuel;
• an accumulator fluidly connected to the tank and configured to receive gaseous fuel from the tank;
• a compressor fluidly connected to the accumulator and configured to compress the gaseous fuel;
• a heat exchanger fluidly connected to the compressor and configured to cool compressed gaseous fuel exiting the compressor;
• an engine configured to drive the compressor;
• and
• a Hilsch vortex generator fluidly connected to the compressor and the tank and configured to:
• receive the compressed gaseous fuel from the compressor,
• separate the compressed gaseous fuel into a first flow of gaseous fuel at a first temperature and a second flow of gaseous fuel at a second temperature lower than the first temperature,
• direct the first flow to the engine, and
• direct the second flow to the tank.