Leak detector for evaporated fuel

Details Leak detector for evaporated fuel Leak detector for evaporated fuel

2008-04-22

2008-04-22

Williams, Hezron (Department: 2856)

Measuring and testing

With fluid pressure

Leakage

C073S04050R, C073S049700

Reexamination Certificate

active

11797967

ABSTRACT:
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.

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