NOVELTY - A fuel cell system comprises a reformer to produce a hydrogen containing gas for use in a fuel cell stack. The reformer, at start-up, is fed with an emulsion composition comprising at least 40 wt.% hydrocarbon, 30-60 wt.% water, and 0.01-5 wt.% surfactant consisting of alkyl ethoxylated amine-alkyl salicylic acid complex, and/or monoethanol amine-alkyl salicylic acid complex.    USE - Used to produce a hydrogen containing gas for use in a fuel cell stack.    ADVANTAGE - The improved fuel cell system delivers, at start-up, the fuel and water as an emulsion to the reformer. By using the emulsion at start-up, a well-mixed water/fuel injection is achieved, which can improve the efficiency of start-up of the reformer. The fuel-water mixture can be sprayed into the reformer, which provides reformer performance advantages over delivery of the fuel and water in a vaporized state. The emulsion has the ability to form emulsions at low shear. The surfactants decompose at below 700degreesC. The emulsion is easily pumpable and the emulsion viscosity decreases with decreasing temperature. The emulsion composition also exhibits detergency and anti-corrosion function to keep clean and clean up of the metal surfaces.    DETAILED DESCRIPTION - A fuel cell system comprises a reformer to produce a hydrogen containing gas for use in a fuel cell stack. The reformer, at start-up, is fed with an emulsion composition comprising at least 40 wt.% hydrocarbon, 30-60 wt.% water, and 0.01-5 wt.% surfactant consisting of alkyl ethoxylated amine-alkyl salicylic acid complex, and/or monoethanol amine-alkyl salicylic acid complex of formulae (I) and (II), respectively.    R = methyl;    n = 2-25;    x and y = integers;    x+y = 2-50.    An INDEPENDENT CLAIM is also included for a method to prepare a bicontinuous microemulsion comprising mixing at mixing energy of 0.15x10-5-0.15x10-3 kW/liter fluid, at least 40 wt.% hydrocarbon, 30-60 wt.% water, and 0.01-5 wt.% surfactant consisting of alkyl ethoxylated amine-alkyl salicylic acid complex, and/or monoethanol amine-alkyl salicylic acid complex.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic diagram of an improved fuel cell system where a start-up system is operably connected to a reformer.