Liquid ejecting apparatus and method of filling liquid in liquid ejecting apparatus

A liquid ejecting apparatus comprising:

• a liquid ejecting portion that ejects a liquid through a nozzle;
• a liquid supply flow path configured to supply the liquid accommodated in a liquid supply source to the liquid ejecting portion;
• a storage portion that is provided in the liquid supply flow path and that stores the liquid, wherein the storage portion includes a flexible portion and changes a volume thereof when the flexible portion is deformed;
• a pressure mechanism that changes the volume of the storage portion by making pressure act on the flexible portion;
• a liquid filling mechanism that includes
• a feed pump mechanism disposed in the liquid supply flow path between the storage portion and the liquid supply source, wherein the feed pump mechanism suctions the liquid inside the liquid supply source and discharges the liquid towards the liquid ejecting portion through the liquid supply flow path, and
• a discharge mechanism that discharges the liquid inside the liquid supply flow path to outside of the liquid supply flow path from the liquid ejecting portion by reducing the pressure in the liquid supply flow path through the liquid ejecting portion;
• and
• a control portion that controls the pressure mechanism and the liquid filling mechanism, wherein the control portion executes,
• a filling process that fills the liquid into the liquid supply flow path by driving the feed pump mechanism and the discharge mechanism while the volume of the storage portion is, by making pressure act on the flexible portion with the pressure mechanism, made smaller than when the pressure does not act on the flexible portion,
• after executing the filling process, an ending process that ends a state in which the pressure is made to act on the flexible portion with the pressure mechanism, and
• after executing the ending process, a filling of the liquid in the storage portion by driving the feed pump mechanism.