What is likely to happen if the fuel filter becomes clogged?

When the fuel filter becomes clogged, it restricts the flow of fuel to the engine. A restricted fuel supply means that the engine may not receive the required amount of fuel for proper combustion, leading to an imbalance in the air-fuel mixture. As a result, the engine may struggle to maintain consistent power, which can manifest as engine stalling. This stalling can occur under various conditions, such as during acceleration, idling, or when the vehicle is under load.

The other options present outcomes that are not typical or relevant when considering a clogged fuel filter. Increased fuel efficiency and improved acceleration would be unlikely, as a clogged filter negatively impacts fuel delivery, which is essential for optimal engine performance. Similarly, a smoky exhaust would not directly correlate with a clogged fuel filter; it is more commonly associated with problems in the combustion process or the introduction of oil into the combustion chamber.