Method and system to ensure full oil tubes after gas turbine engine shutdown

A method of operating a lubrication system for a gas turbine engine, the method comprising:

• pumping a lubricant from a supply conduit to a bearing compartment;
• creating a pressure differential in the bearing compartment;
• evacuating the supply conduit in response to the pressure differential creating step;
• refilling the supply conduit with the lubricant from a reservoir conduit fluidly joined to the supply conduit at a junction by gravitationally draining the reservoir conduit;
• and
• wherein the lubrication system includes a main pump fluidly connected to the bearing compartment by a supply line, and the pumping step includes providing lubricant to the bearing compartment through a supply line that splits into the supply conduit and the reservoir conduit that are fluidly parallel to one another for a length before rejoining with one another at the junction.