Fuel line heat shields are used to protect the fuel lines from the heat generated by the engine and exhaust system. This is important because excessive heat can cause the fuel to vaporize, which can lead to fuel system malfunctions and even engine fires.

The heat shields are typically made of materials that can withstand high temperatures, such as aluminized sleeve, silicone heat sleeve and titanium sleeve, and are designed to fit around the fuel lines to provide a barrier between the lines and the heat source.