A method of sealing a glow plug of a fuel cell system, the glow plug including a housing and a heating element extending from a first end of the housing. The method includes inserting the heating element into a sealing element having an annular base and a tubular collar extending from the base and forming a fluid-tight connection between the glow plug and the fuel cell system by attaching the collar to the heating element and by attaching the base to the first end of the housing.