What is the function of a fuel pump in an oil heating system?

The function of a fuel pump in an oil heating system is to transfer fuel oil from the tank to the burner. This is a crucial role because the fuel pump ensures that the correct amount of fuel is delivered to the burner for efficient combustion.

In oil heating systems, the fuel needs to be moved from a storage tank to the burner nozzle where it gets atomized and mixed with air for proper ignition and burning. The pump creates the necessary pressure to push the fuel through the line, overcoming any resistance and ensuring a steady supply during the heating cycle. This process is vital for maintaining the system's efficiency and reliability in providing heat.

The other options do not align with the primary function of a fuel pump. While mixing fuel with air and igniting the oil are essential parts of the combustion process, they are typically handled by other components such as the burner and ignition system. Likewise, filtering impurities from the oil is the role of fuel filters, designed to cleanse the fuel before it reaches the burner. Thus, the fuel pump's main job remains the transfer of fuel oil, positioning it as a critical component in the overall operation of the heating system.