Fuel supply devices

A fuel supply device comprising:

• a cover including a substantially disk-shaped set plate configured to cover an opening of a fuel tank;
• a base including a base main body, comprised of an upper base to which a fuel pump is attached, as well as a lower base configured to abut a bottom surface of the fuel tank;
• and
• a connecting portion including a rod member and a joint portion comprising a trapezoidal perforated piece which allows the connection portion to be extendable and retractable along the rod member, where additionally a spring member is present between the joint portion and the cover, wherein the connecting portion is configured to connect the cover and the base, wherein
• the base main body and the connecting portion are connected by:
• a connecting shaft including a shaft portion extending from the upper base parallel to a Y-axis, perpendicular to an XZ plane, and a bulge portion comprising the terminal end of the shaft portion, with thickness of the shaft portion in an X direction increased at the bulge portion, relative to the shaft portion,
• a connecting hole at a bottom-backwards edge of the joint portion relative to the XZ plane, that includes an engagement region through which the shaft portion of the connecting shaft is allowed to pass while the bulge portion is not, and an insertion region through which the bulge portion is allowed to pass, wherein the insertion region is contiguous with the engagement region, and
• a stopper piece configured to limit a movable range of the shaft portion of the connecting shaft towards the insertion region when the shaft portion is located within the engagement region,
• wherein the connecting portion and the base are connected in a relatively movable manner, through insertion of the connecting shaft into, and through its engagement with, the connecting hole,
• where a guide mechanism is provided wherein the guide mechanism is configured to guide at least one part of the connecting shaft or the stopper piece to move so that at least one part of the stopper piece is positioned between the bulge portion and the base when a predetermined amount of force is applied to the connecting shaft.