Fuel supply device

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

• a cover body that is installed to an upper wall of the fuel tank;
• a pump unit, in which one of a rotatable shaft portion and a support inner peripheral surface is formed to extend along a rotational axis that extends in a transverse direction, wherein a bottom of the pump unit is configured to be placed on a bottom wall of the fuel tank, and the pump unit is configured to discharge the fuel, which is in the inside of the fuel tank, toward the internal combustion engine;
• a coupling stay, in which another one of the rotatable shaft portion and the support inner peripheral surface is formed to extend along the rotational axis, wherein:
• the coupling stay couples between the cover body and the pump unit;
• the another one of the rotatable shaft portion and the support inner peripheral surface provides radial support to the one of the rotatable shaft portion and the support inner peripheral surface;
• a support lateral surface of the coupling stay, which extends in a longitudinal direction of the coupling stay, provides thrust support to the pump unit;
• and
• the another one of the rotatable shaft portion and the support inner peripheral surface extends from the support lateral surface in the transverse direction;
• a lock claw that projects from the coupling stay;
• and
• a lock projection that projects from the pump unit and is operable to lock rotation of the pump unit relative to the coupling stay about the rotational axis upon fitting of the lock projection between the support lateral surface and the lock claw, wherein in a state where the lock projection is fitted between the support lateral surface and the lock claw while the bottom of the pump unit is placed on the bottom wall of the fuel tank, a contact surface of the lock projection, which contacts the support lateral surface, is entirely placed on a side of the rotational axis where the bottom wall of the fuel tank is placed in the longitudinal direction of the coupling stay.