The Fuel Supply Tube with Part Number 3966128 is a crucial component of the fuel system in a truck. This tube connects the fuel pump to the fuel injectors and ensures that a consistent supply of fuel is delivered to the engine. The tube is typically made of metal or plastic and can vary in length depending on the specific model of truck it is designed for. The Fuel Supply Tube plays a vital role in maintaining the proper functioning of the engine, as any interruption or leak in this system can cause significant damage to other parts. Proper maintenance and inspection of this component are essential for optimal performance and efficiency of a truck’s engine.