An available feedstock fuel is not always suitable for feeding it directly into the fuel processing reactor. Sometimes it needs to be brought to a higher pressure or temperature; sometimes contaminants have to be taken out (such as sulphur in natural gas). This is done in a fuel preparation module. Fuel preparation in the existing products based on natural gas uses well known processes and is easy to adapt to flow, pressure and temperature. When using renewable fuels such as biogas or bio-ethanol, fuel preparation is more complex and the fuel preparation module needs to be adapted to the conditions of the actual source, which in some cases even change over time. HyGear can adapt to many feedstock fuels and is striving to even cover a wider variety in the future.