Tessaracts cannot convert between EU and MJ. In fact, Tessaracts can't accommodate either power type at all, they use RF. You will need to convert the EU to RF (I see Engineers Toolbox installed and I hear that can do it but I haven't tried it myself, Power Converters can do it as well) THEN hook the RF feed into the tessaract at the power source end. At the pump end you will need an RF capable conduit (a leadstone energy conduit is more than enough for this task) between the Tessaract and the pump. Finally Buildcraft Pipes DO NOT connect to Thermal Expansion blocks. You will need to use a compatible liquid transport like the Fluid conduits as well.