A vacuum suction unit 2 composed of a surge tank 7 and a vacuum tank 8; A control piston 3 for interrupting the door 9 of the fuel filler together with the vacuum suction unit 2; A control valve 4 controlled by the vacuum suction unit 2 and the control piston 3; A vacuum cylinder 5 controlled by the control valve 4; And a door opening and closing part 6 for opening and closing the door 9 while being controlled by the vacuum cylinder 5 as described above.;When the fuel filler door switch 12 is turned on while the driver starts the engine at the time of injecting fuel into the automobile, the door 9 of the fuel filler is automatically opened by the operation of the door opening / closing device 1 Fuel can be injected, and when the fuel supply is completed and the lubricator is taken out, the door 9 of the fuel filler can be turned off automatically by the operation of the door opening / closing device 1 by the detection of the infrared ray detector 13 Is a safety lubrication system.
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