What is a common sign of inadequate fuel oil pressure?

A common sign of inadequate fuel oil pressure is that the flame flickers or fluctuates. This occurs because the burner is unable to maintain a consistent flow of fuel to the combustion chamber, leading to an unstable flame pattern. When the pressure is too low, the atomization process of the oil is impaired, resulting in incomplete combustion, which can manifest as a flickering or uneven flame. This instability can not only affect the efficiency of the burner but also impact both the safety and performance of the heating system, potentially leading to higher emissions and damage over time.

While other signs might indicate issues with the heating system—like loud noises from the furnace, an odor of oil, or increased heating costs—those are not specifically indicative of inadequate fuel oil pressure in the same direct manner as a fluctuating flame. Loud noises can suggest mechanical issues or improper installation, an oil odor may signify a leak that needs addressing, and increased costs could result from various inefficiencies rather than pressure issues alone.