An evaporated fuel leak detector detects leakage of an evaporated fuel generated in a fuel tank. The detector includes: a differential pressure valve, a pump for sucking a detection port side to reduce pressure on a fuel tank side, and pressure detection means for detecting pressure on a detection port side. The valve includes a detection port connecting to a fuel tank side, an atmosphere port opened to atmosphere, a pressure chamber and a valve member displaceable in accordance with differential pressure between the detection port and the pressure chamber for connecting and disconnecting a connection between the detection port and the atmosphere port. The valve member disconnects between the detection port and the atmosphere port in a case where pressure of the pressure chamber becomes larger than pressure of the detection port by a predetermined pressure.
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a division of application Ser. No. 11/324,582, filed Jan. 4, 2006, now U.S. Pat. No. 7,231,813 the entire contents of which is hereby incorporated by reference in this application. This application is also based on Japanese Patent Applications No. 2005-5274 filed on Jan. 12, 2005, and No. 2005-194611 filed on Jul. 4, 2005, the disclosures of which are incorporated herein by reference.
Priority Data
Jan 12, 2005 [JP] 2005-5274 Jul 04, 2005 [JP] 2005-194611
