Fuel gas supplying and filling system

A fuel gas supplying and filling system comprising:

• a supply passage configured to connect a fuel gas consuming unit configured to consume a fuel gas and a high-pressure tank configured to store the fuel gas of high pressure;
• a pressure regulating valve provided on the supply passage and configured to regulate pressure of the fuel gas flowing through the supply passage;
• and
• an electromagnetic on-off valve provided on the supply passage so as to be located upstream of the pressure regulating valve and configured to be able to open and close the supply passage, wherein:
• a fill passage is connected to a portion of the supply passage, the portion being located between the pressure regulating valve and the electromagnetic on-off valve;
• the fill passage is configured such that the fuel gas of the high pressure is able to be filled through a filling opening;
• and
• when the fuel gas of the high pressure is introduced through the filling opening, the electromagnetic on-off valve opens the supply passage, which has been shut off by the electromagnetic on-off valve.