Polyethylene glycol of different molecular weights and concentrations was added to an electrically percolating quaternary water-in-oil microemulsion made of cyclohexane, 1-pentanol, sodium dodecyl sulfate, and water. Measurements on the obtained solutions were made by electrical conductivity, luminescence probing, and dynamic light scattering. We found, that small size polymer affects only the water-oil interface while large size polymer induces a percolation structure by passing through an initial growth of the polymer-containing aggregates.