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Section M2204 Oil Pumps and Valves
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A manual shutoff valve shall be installed between the oil supply tank and the burner. Such valve shall be provided with ready access. 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.