Patent ID: 7472583
Filing Date: 2009-01-06
Classification: F02M

Abstract:
1. A detector for detecting evaporated fuel leakage from a fuel tank, the detector comprising: a pump for pressurizing or depressurizing the fuel tank; a pressure sensor for detecting a pressure in the fuel tank; a housing containing the pump and the pressure sensor therein, the housing forming a tank passage connected to the fuel tank, an atmospheric passage open to the atmosphere and a sensor chamber in which the pressure sensor is disposed; a sensor passage, formed in the housing, communicating with an inlet port of the pump and the sensor chamber, the sensor passage being substantially parallel to the tank passage; an orifice disposed in the tank passage at a position connecting the tank passage to the fuel tank, the orifice having a reference opening which is the same as an opening permitted to the fuel tank; and an orifice passage at one end of which the orifice is positioned and at the other end of which the sensor passage is connected, the orifice passage being inclined relative to the tank passage, wherein: the orifice passage is inclined relative to the sensor passage, making an obtuse angle between the orifice passage and the sensor passage.