The contact called on behalf of a client who owns a 2013 Ford Fusion. The owner took the vehicle to an independent mechanic to have the water pump replaced. The contact stated while test driving the vehicle, he started to smell smoke inside the cab of the vehicle. The contact stated no warning light was illuminated. The contact was able to drive back to the independent mechanic, open the hood, and saw fire on the engine. The contact stated he extinguish the fire with a fire extinguisher. No fire report was filed. The contact stated no one was injured nor sought medication attention. The contact stated oil was coming through the cylinder head and caused the fire. The vehicle was not drivable. The contact called the local dealer and made them aware of the failure. The vehicle was not diagnosed by the dealer or repaired. Upon investigation, the contact associated the failure with NHTSA Campaign Number: 17V209000 (Engine and Engine Cooling), however the VIN was not included. The manufacturer had been informed of the failure. The failure mileage was unknown.