What determines the compatibility of fuel with engine components?

The compatibility of fuel with engine components is primarily determined by the material composition of hoses and seals. This compatibility is crucial because different fuels can react differently with various materials, potentially leading to compatibility issues such as degradation, swelling, or brittleness of the hoses and seals. For instance, fuels that contain ethanol can be corrosive to certain rubber or plastic materials, while others may withstand such exposure without compromise.

Understanding the composition of materials used in these components helps in selecting the right fuel for the engine, ensuring that the system operates efficiently and safely over time. Therefore, the focus on material composition is essential for maintaining the integrity and longevity of the engine's fuel system.