Abstract: A pumping device includes a barrel, a top cover mounted on an open top of the barrel, a cylinder mounted in the barrel and connected to the top cover, a piston movably mounted in the cylinder, a plurality of check valves mounted on the piston, an operation unit mounted on the top cover and connected with the piston, a connecting unit mounted in the barrel and connected between the barrel and the cylinder, and a pressure adjusting unit connected between the barrel and the top cover. Thus, when the air pressure in the receiving chamber of the barrel reaches a predetermined value, the pressure adjusting unit provides a pressure release function to partially release the air pressure in the receiving chamber of the barrel so as to ensure a safe operation of the pumping device.

Abstract: A pumping device includes a barrel, a top cover mounted on an open top of the barrel, a cylinder mounted in the barrel and connected to the top cover, a piston movably mounted in the cylinder, a plurality of check valves mounted on the piston, an operation unit mounted on the top cover and connected with the piston, a connecting unit mounted in the barrel and connected between the barrel and the cylinder, and a pressure adjusting unit connected between the barrel and the top cover. Thus, when the air pressure in the receiving chamber of the barrel reaches a predetermined value, the pressure adjusting unit provides a pressure release function to partially release the air pressure in the receiving chamber of the barrel so as to ensure a safe operation of the pumping device.

Abstract: A fuel door assembly includes an annular support seat, a torsion spring, and a pivot cover. Thus, the fuel door assembly that, when being opened, can be positioned rigidly without collapse, thereby facilitating the fuel filling operation. In addition, when the pivot cover is pivoted relative to the support seat to move to the opened position, the operation section of the torsion spring is urged on the comer of the press block of the pivot base of the pivot cover by the restoring force of the torsion spring, so that the pivot cover is positioned on the support seat rigidly and stably without collapse and detachment.