An apparatus for saving fuel for a vehicle is provided to activate the fuel supplied to the engine and to increase the fuel efficiency and performance of the vehicle according to the overlapped first and second filters. An apparatus for saving fuel for a vehicle is composed of a cylindrical body formed with penetration holes(13,15) at one end and the other end and mutually combined with a cover(12) and a body(14); a fuel inlet combining member(20); a fuel outlet combining member(22); a first filter unit(30); a first neodymium ring(40); a first amethyst ball(42); a first ceramic ring(44); a first crystal ball(46); a second neodymium ring(48); a first germanium ceramic fossil ball(50); a third neodymium ring(52); a second amethyst ball(54); a second ceramic ring(56); a second crystal ball(58); a fourth neodymium ring(60); a second germanium ceramic fossil ball(62); a second filter unit(70); and an elastic member(80) arranged in the body and placed in the elastically deformed condition between the filter unit and the inner wall of one end of the body to compress the second filter to the other side. The first and second filters are overlapped.
