FUEL SUPPLY DEVICE

摘要

A fuel supply device (1) is provided with a fuel pump (42), a filter case (43), a fuel passage (470), a discharge passage (472), and a residual pressure holding valve (475). A communication port (470e) opens at a positional shift part (R) of the fuel passage (470) at which the position thereof is shifted toward the discharge passage (472) side from the residual pressure holding valve (475). The fuel passage (470) forms an external passage section (470f) in which fuel is made to flow from the communication port (470e) toward the discharge passage (472) side and an internal passage section (470g) in which the flow of fuel that is made to flow from the communication port (470e) toward the residual pressure holding valve (475) side is constricted more than in the external passage section (470f). When the passage cross-sectional area of the internal passage section (470g) is converted to the passage cross-sectional area of a cylindrical pipe (P), the passage diameter D of the cylindrical pipe (P) and the length L of the internal passage section (470g) satisfy the relational expression L/D ≥ 3.