In the present work the liquid-liquid equilibrium (LLE) data were obtained for systems relevant for biodiesel production process. The ternary systems of FAMEs + vegetable oil + methyl alcohol and FAMEs + glycerol + methyl alcohol were investigated at the three temperatures of 293, 313 and 333 K and atmospheric pressure. The experimental LLE data have been correlated using NRTL model and binary interaction parameters of systems components have been calculated. Using F-test the reliability of the experimental data and the adequacy of NRTL activity coefficient models with obtained binary interaction parameters have been confirmed.