What is one major consequence of not addressing high water content in fuel?

Addressing high water content in fuel is crucial because water can significantly impact engine performance and reliability. When fuel contains an excessive amount of water, it can lead to corrosion of engine components, disrupt the combustion process, and promote the growth of microbial organisms, which in turn can clog filters and damage injectors. These issues can lead to poor engine performance and ultimately result in engine failure.

On the other hand, the other options suggest beneficial outcomes that do not occur when high water content is present in fuel. Increased fuel efficiency, improved engine lubrication, and longer fuel shelf life are all attributes that would not manifest when water compromises fuel quality. Instead, without proper management of water content within fuel, the risks to engine health and operational effectiveness significantly rise.