Patent ID: 7207209
Filing Date: 2007-04-24
Classification: F02M,Y10T

Abstract:
1. A leak detecting system for detecting fuel evaporation gas leakage of an automobile fuel supply device, comprising: a fuel pump, a jet pump, and a vent valve, which are disposed in a fuel tank, a fuel flow path system including a relief line connected to the fuel pump for relieving a portion of fuel sucked by the fuel pump as excess fuel, said jet pump being disposed in the relief line; a relief flow path switching valve disposed in the relief line on a downstream side of the jet pump; and a sub-line for connecting the relief flow path switching valve and the vent valve, an air flow path system including a first air flow line adapted to connect the vent valve to a canister; a second air flow line for connecting the first air flow line to the jet pump; and an air flow switching valve disposed in the second air flow line for switching a communicating state and a non-communicating state between the first air flow line and the second air flow line so that the jet pump operated by the excess fuel sucks air into the fuel tank through the first air flow line and the second air flow line in the communicating state, and an inner pressure sensor provided to the fuel tank for detecting an inner pressure of the fuel tank so that a leakage condition in the fuel tank when air is supplied into the fuel tank is detected.