Abstract: A pre-heater system for a combustion engine. The combustion engine uses a liquid fuel and air, and is cooled by a cooling system. The pre-heater system includes a fuel pre-heater. The fuel pre-heater includes a coolant reservoir and a fuel line traversing the coolant reservoir. The coolant reservoir is in a fluid relationship with the cooling system, and the fuel line is in a fluid relationship between a fuel tank and the combustion engine. In some embodiments, the pre-heater system further includes an air pre-heater. The air pre-heater comprises an air box and a coolant line traversing the air box. The air box is in a fluid relationship between the ambient air and the combustion engine, and the coolant line is in a fluid relationship with the cooling system. In operation, the fuel and air is heated before being consumed by the combustion engine.