1) Use a Chassis with very low Energy Usage.
2) Use a Cockpit with very low Energy Usage AND very high Internal Power.
2) Do NOT put on a Generator OR Fuel Tank.
4) Do NOT exceed your HOUND's Energy Usage.
Your HOUND will have an Approx. Effect Time of 0 and the No Fuel icon will appear once you start a round, but you will still be at optimal efficiency, thus emulating Infinite Fuel.