Engine fuel system with heat dissipation function

The engine fuel system with the heat dissipation function comprises an oil tank, an engine and an engine control module, an oil supply pipeline and an oil return pipeline are arranged between the oil tank and the engine, the oil tank is provided with a fuel pump, the engine is provided with a high-pressure oil pump, and an oil return pipeline branch is arranged on the rear half section of the oil return pipeline in parallel; a heat dissipation pipeline connected with the oil return pipeline branch is arranged in the oil tank; a three-way connector is arranged at the joint of the oil return pipeline and the oil return pipeline branch, a temperature sensor is arranged on the oil return pipeline, a valve is arranged on the oil return pipeline branch, and the temperature sensor and the valve are both connected with the engine control module. According to the invention, effective and rapid heat dissipation of fuel oil of an engine fuel oil system is realized, the back pressure in an oil return pipeline is not incr