Question: what are fuel filter symptoms?
Answer: Trouble Starting the Engine. The most common sign of a clogged fuel filter is trouble starting the car, since it depletes the oil supply going to the engine. ... 
Issues Accelerating. ... 
Frequent Idling and Sputtering. ... 
Strong Odors. ... 
Engine Misfires/Low Performance. ... 
When to Replace the Fuel Filter.