Fuel supply device

A fuel supply device configured to supply fuel from an inside of a fuel tank to an internal combustion engine, comprising:

• a cover body that is configured to be installed to an upper wall of the fuel tank;
• a pump unit that is configured to be placed on a bottom wall of the fuel tank and is configured to discharge the fuel from the inside of the fuel tank toward the internal combustion engine;
• and
• a coupling stay that couples between the cover body and the pump unit, wherein:
• the coupling stay includes:
• an upper stay that extends on a lower side of the cover body;
• and
• a lower stay that is installed to the pump unit and is slidably fitted to the upper stay in a top-to-bottom direction;
• and
• a stress concentrating portion, which reduces a cross-sectional area to concentrate a stress around the stress concentrating portion, is formed at a specific location of the lower stay, the specific location being located immediately above a lower end part of the lower stay;
• the lower stay is slidably fitted into the upper stay from a lower side of the upper stay;
• the stress concentrating portion is formed at the specific location of the lower stay, which is placed at an outside of the upper stay;
• the upper stay includes:
• an upper tube segment that forms a hollow tubular portion;
• and
• an upper column segment that forms a solid column portion;
• the lower stay includes:
• a lower column segment that forms a solid column portion;
• and
• a lower tube segment that forms a hollow tubular portion;
• the lower column segment is slidably fitted into the hollow tubular portion of the upper tube segment from a lower side of the hollow tubular portion of the upper tube segment;
• the upper column segment is slidably fitted into the hollow tubular portion of the lower tube segment from an upper side of the hollow tubular portion of the lower tube segment;
• and
• the stress concentrating portion is formed at the specific location of the lower stay located in at least one of the lower column segment and the lower tube segment.