STRUCTURE OF ATMOSPHERIC AIR INTRODUCTION PART

PROBLEM TO BE SOLVED: To provide a structure of an atmospheric air introduction part which can be used by both of fuel piping systems requiring and not requiring an internal pressure sensor. SOLUTION: An atmospheric air introduction part (A) is equipped with a canister drain box 5 including an intake port 21a for feeding atmospheric air to a canister for temporarily capturing evaporated fuel through an atmospheric air introduction pipe P1 and an atmospheric pressure introduction box 6 including an atmospheric pressure introduction port 22a for introducing atmospheric pressure to the internal pressure sensor for detecting inside pressure in a fuel piping system through an atmospheric pressure introduction pipe P2. The canister drain box 5 and atmospheric pressure introduction box 6 are coupled to be one component and provided with flow paths 51, 61 with a labyrinth structure for preventing foreign matter from entering the atmospheric air introduction pipe P1 and atmospheric pressure introduction pipe P2. COPYRIGHT: (C)2009,JPO&INPIT