Hi guys,

I'm having problems with fuel filter, especially with it's heater. I'm driving TD75 Marea on Biodiesel and now when it's colder my filter can't pass fuel. I heard that there is some kind of heater built in filter but I can’t locate it. Till now I haven’t have problems with filter clogging (it was even colder than now) and whenever I checked fuel filter was warm and now it’s cold so I think the problem is in heater! There are four wires coming into fuel filter how do I know which ones are right ones. Does anyone know how is this heater working?

Thanks!