To provide a water separator of simple construction, functioning to remove only water contaminated in an alcohol-containing fuel, to thereby prevent incomplete combustion and the corrosion of a fuel system, to thereby improve the economy of an engine.
The water separator has a construction and mechanism, wherein a water separatory section 3 is installed at the bottom of a fuel tank T for reserving an alcohol-blended gasoline fuel to be fed to an engine 1's injector 11, the water separatory section 3 is so designed as to be divided into an upper liquid chamber 34 and a lower gas chamber 35 through a component-separating wall 31 composed of a porous substrate 32 and a separation membrane 33, and works in such a way as to bring an aqueous layer with alcohol dissolved therein accumulated at the bottom of the fuel tank T to the liquid chamber 34, and operate a pressure-reducing pump P1 set at a negative-pressure pipe 43 communicating with the gas chamber 35 to pass only water fraction through the component-separating wall 31 and temporarily reserve it in the gas chamber 35. The water fraction thus reserved is discharged by opening a solenoid valve V1 of a drain pipe 44 connected to the bottom of the gas chamber 35.
NISHIJIMA YOSHIAKI
KUROYANAGI MASATOSHI
KIYOZUMI YOSHIMICHI
NAT INST OF ADV IND & TECHNOL
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