What potential issue can arise from using improper fuel types in a system?

Using improper fuel types in a system can lead to reduced engine performance because each engine is designed to operate with a specific fuel type that has certain characteristics like octane rating, viscosity, and chemical composition. When an engine is fueled with a type that does not match these specifications, it can cause incomplete combustion, leading to issues such as knocking, increased emissions, and potentially overheating. This can result in decreased power output and overall efficiency, hampering the engine's ability to perform optimally. Therefore, selecting the correct fuel type is crucial for maintaining engine performance and ensuring it operates within the intended parameters.