Patent ID: 6353955
Filing Date: 2002-03-12
Classification: B60K,F16K,Y10T

Abstract:
An evaporation fuel discharge control device comprising:a canister for adsorbing evaporation fuel from a fuel tank having a tank main body with a fuel supply pipe; an evaporation fuel passage for connecting said tank main body and said canister; a float valve disposed within the tank main body for closing an entrance portion of said evaporation fuel passage when fuel within the tank main body exceeds a predetermined liquid level; a switch valve including a positive pressure chamber and a back pressure chamber, said evaporation fuel passage being disposed on a side of said positive pressure chamber, and said switch valve being structured such that the switch valve can be opened when a pressure on a side of said positive pressure chamber is higher by a predetermined value or more than a pressure on a side of said back pressure chamber; a pressure introduction passage for connecting an entrance portion of said fuel supply pipe to said back pressure chamber of said switch valve; first communicating means for allowing an upstream side of said switch valve to communicate with said pressure introduction passage when a pressure on the upstream side of said switch valve is higher by a predetermined value or more than a pressure on a side of said pressure introduction passage; and second communicating means for allowing the upstream side of said switch valve to communicate with said pressure introduction passage when the pressure on the side of said pressure introduction passage is higher by a predetermined value or more than the pressure on the upstream side of said switch valve.