What is one common indicator of fuel contamination?

The presence of sediment or water at the bottom of a fuel tank is a common indicator of fuel contamination because it often signifies that impurities or unwanted substances have settled in the fuel system. Over time, fuel can become contaminated with water, which may enter the tank through various means such as condensation, leaks, or improper storage practices. Additionally, sediments can come from corrosion, degradation of the tank, or debris introduced during fuel transfer. When these contaminants collect at the bottom of the tank, they can lead to operational issues such as poor combustion, clogging fuel filters, or even engine damage if not addressed promptly. Thus, identifying sediment or water buildup is crucial for maintaining fuel quality and ensuring the overall integrity of the fuel system.