Which condition in the fuel system is most likely caused by a restricted fuel filter?

• A. Engine seizes immediately
• B. Overfueling of injector
• C. Excessive smoke
• D. Loss of power due to restricted fuel flow

Answer: (D)

A restricted fuel filter creates a bottleneck in the fuel path, reducing how much fuel can reach the engine. When the engine demands more fuel—such as during acceleration or under load—the supply falls short, causing a drop in injector flow and overall fuel pressure. That shortfall translates directly into loss of power and sluggish response because the engine can’t maintain the required combustion energy.

Other options don’t fit as well because a clogged filter tends to starve the engine of fuel, not flood it. Immediate engine seizure isn’t the typical result of a blocked filter, and overfueling of injectors would come from too much fuel reaching the system rather than a restriction. Excessive smoke would be more indicative of other issues affecting combustion.