Oil pumps shall be positive displacement types that automatically shut off the oil supply when stopped. Automatic pumps shall be listed and labeled in accordance with UL 343 and shall be installed in accordance with their listing.
A readily accessible manual shutoff valve shall be installed between the oil supply tank and the burner. Where the shutoff valve is installed in the discharge line of an oil pump, a pressure-relief valve shall be incorporated to bypass or return surplus oil. Valves shall comply with UL 842.
Pressure at the oil supply inlet to an appliance shall be not greater than 3 pounds per square inch (20.7 kPa).
Fuel-oil lines incorporating heaters shall be provided with relief valves that will discharge to a return line when excess pressure exists.