A fuel injector filter is a small, protective component at the head of a fuel injector that filters out contaminants like dust, dirt, and rust to prevent the injector from clogging. These filters are critical for engine performance and longevity, and when they become clogged, they can cause symptoms such as difficulty starting, poor acceleration, rough idling, and reduced fuel efficiency. It is recommended to clean or replace them as part of regular vehicle maintenance.
