What are the consequences of running an aircraft engine with contaminated fuel?

Running an aircraft engine with contaminated fuel can lead to serious issues that directly affect the performance and reliability of the engine. Contaminated fuel may contain water, dirt, bacteria, or other foreign substances that can clog fuel filters, disrupt fuel flow, and lead to inefficient combustion.

The presence of contaminants can result in reduced engine performance, which is characterized by a decrease in power output and possible fluctuations in engine operation. Moreover, the contaminants can cause wear and tear on engine components, leading to potential engine failure. Such a failure could occur suddenly and without warning, posing a significant safety risk during flight.

In contrast, options suggesting increased fuel efficiency or enhanced engine lifespan are misleading, as contaminated fuel will typically lead to the opposite result—decreased efficiency and shortened engine life due to the additional strain and damage caused to engine components. Additionally, the notion that there would be no effects on performance disregards the fundamental principles of combustion and engine operation, where fuel quality is crucial for optimal performance.