NOVELTY - A fuel separator (1) is obtained by molding composition containing porous artificial graphite material having true density of 1.63-2.20 g/ml and average particle diameter, epoxy resin comprising main agent and curing agent, and internal mold release agent. The main agent is ortho-cresol novolak type epoxy resin having epoxy content and high shear viscosity of 0.20-1 Pa.seconds. The curing agent is phenol novolak resin having hydroxyl content and high shear viscosity of 0.30-0.50 Pa.seconds. The fuel separator has thin wall portion (13) having average thickness.    USE - Fuel separator is used for polymer electrolyte fuel cell used as alternative power supply for vehicle mounted internal combustion engine, home-use, campsite, motor vehicle, small vessel, satellite and space explorations.    ADVANTAGE - The fuel separator having excellent bending strength, flexural strain, moldability, handleability, flexibility and accuracy in thickness, is prepared easily in high yield. The polymer electrolyte fuel cell comprising the separator has excellent electric power generation.    DETAILED DESCRIPTION - A fuel separator is obtained by molding composition containing (in mass parts) porous artificial graphite material (100) having true density of 1.63-2.20 g/ml and average particle diameter of 20-100 mu m, epoxy resin (19-30) comprising main agent and curing agent, and internal mold release agent (0.1-1). The main agent is ortho-cresol novolak-type epoxy resin having epoxy content of 195-216 g/equivalent and high shear viscosity of 0.20-1 Pa.seconds at 150 degrees C. The curing agent is phenol novolak resin having hydroxyl content of 103-106 g/equivalent and high shear viscosity of 0.30-0.50 Pa.seconds at 150 degrees C. The fuel separator has thin wall portion having average thickness of 0.12-0.20 mm. The internal mold release agent is metal soap. Long-chain fatty acid and hydrocarbon type synthetic wax(s).    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of fuel separator.    Fuel separator (1,2,3)    Surface (11)    Gas flow groove (11A,21A,22A)    Separator surface (12)    Thin portion (13,23,33)