What is the likely effect of a fuel filter blockage on a burner's performance?

A blockage in the fuel filter can significantly affect the burner's performance by restricting the flow of oil to the burner. When the fuel supply is interrupted or diminished due to this blockage, the burner may not receive the proper amount of fuel needed for efficient combustion. As a result, the flame can flicker or even extinguish entirely since there isn't enough fuel being delivered to sustain a steady burn. This interruption in fuel supply can lead to unstable burner operation and potentially trigger safety mechanisms designed to shut the system down if proper burning conditions are not met. Thus, the expected outcome is that the flame may flicker or go out entirely, indicating the issue with fuel delivery caused by the blockage in the fuel filter.