A liquid ejecting apparatus includes a liquid ejecting head that ejects liquid through nozzles, a liquid accommodating portion which accommodates the liquid to be supplied to the liquid ejecting head, and a filter chamber which is arranged in a liquid supply path between the liquid ejecting head and the liquid accommodating portion and includes a filter. Oxygen is separated from ambient air with an oxygen separator in discrete pulses, one pulse at a time. When the engine is stopped, the characteristic data stored in an INJ-EEPROM are updated into the characteristic data stored in the ECU. A planetary transmission may be used to automatically change gear ratios in response to the changes in torque.