Passing type fuel reformer

A passing type fuel reformer comprising a cylindrical body having a peripheral surface, said cylindrical body being covered at opposite ends with lids and formed in the peripheral surface thereof and in the surfaces of the lids with through-holes said cylindrical body being charged at a filling rate of not less than 90% with spherical particles having a substantially equal diameter where said spherical particles are formed by a process comprising kneading, granulating, drying, calcining and polishing a ceramic powder with a radioactive rare-earth mineral ore powder, said through-holes having a diameter smaller than that of the spherical particles with an open area of said lids being not less than 50%, said cylindrical body being fitted in a rigid tube body where said rigid tube body is provided with a seal member between an outer peripheral surface of the cylindrical body and an inner surface of the rigid tube body said seal member being located so that more than one flow-path into the rigid tube body is provided, said rigid tube body having connectors removably fitted to said opposite ends of the rigid tube body for connection to a fuel pipe between a fuel tank and an engine.