The study of a structure electrohydrodynamic flows shown on range of properties of flows, which may be to use in kind technical tasks. One of this tasks is filtration of liquid fuel (the most of fuels are liquid dielectrics). Usually for this aims was used passive filters and pumps, in which was many revolving and rubbing details. In electrohydrodynamic filter, which are described lower, the revolving details and friction between them are absent. The physical explanation of this method was presented in early papers. Inexperiments it was found out influence of an electrical bulk charge to effect of separation in liquid dielectrics.