What might indicate a failing fuel pump in a gasoline engine?

A failing fuel pump in a gasoline engine often leads to insufficient fuel delivery, which can manifest as difficulty starting the engine or it stalling during operation. This occurs because the engine requires a specific amount of fuel to maintain combustion. If the fuel pump isn’t functioning properly, it may not supply the necessary volume or pressure, causing the engine to struggle to start or to run smoothly.

When the fuel supply is inadequate, the air-fuel mixture becomes imbalanced, leading to issues like hesitation, stalling, or failure to start entirely. These symptoms are directly related to the performance of the fuel pump and are clear indicators that it may require inspection or replacement.

Other options do not directly relate to the specific failure of a fuel pump. For example, increased acceleration may actually indicate that the fuel pump is delivering fuel effectively, while higher engine temperatures typically pertain to the cooling system or issues with engine timing rather than fuel delivery. Louder engine noise could signal a variety of mechanical issues but is not specifically indicative of fuel pump failure.