Question: how do you know when you need to change your fuel filter?
Answer: Car Has Difficulty Starting. This could be a sign that your filter is partially clogged and on its way to being completely dammed up.
Car Won't Start. This could be caused by varying issues, and one of them is a fuel filter problem. ... 
Shaky Idling. ... 
Struggle at Low Speeds. ... 
Car Dies While Driving.