Why is it important to bleed fuel lines prior to burner operation?

Bleeding fuel lines prior to burner operation is essential primarily to remove air bubbles. When there is air trapped in the fuel lines, it can disrupt the continuous flow of fuel to the burner. This can lead to inefficient combustion, fluctuations in fuel delivery, and operational issues such as incomplete burning or even misfires. Removing air from the system ensures that only fuel reaches the burner, promoting stable and efficient operation.

Having a clear path for the fuel helps maintain a consistent pressure and flow rate, which is critical for optimal burner performance. If air is not purged from the fuel lines, it can cause the burner to experience erratic behavior or even fail to ignite, leading to potential safety hazards and inefficiencies in heating.