After listening to various threads of discussion over on the POCUK forums it now seems that my Pajero has a heated fuel filter head unit rather than the standard non-heated version. I had wondered about my filter head when I changed the filter as neither the Haynes or Russek manuals had any reference to how mine looks.
The basic difference between the non-heated and heated versions to look at is that the heated one has two wires going into the top of the unit whereas the non-heated one has non going into the top. Both have a wire going into the bottom of the filter itself via the water sensor. I can only show you a picture of my heated version as I don’t have a picture of the standard unit:
So there’s obviously a big wire going into the side of the head that leads to a plug. I believe this to be the power for the head heater. If you trace the other wire coming out of the plug you can just see a metal plug-type thing – this plugs into the nut at the top/back of the picture, which has a hole in it (not the best of pictures to show this). I believe this is a temperature sensor that will turn off the heater once it’s got to a certain temperature.
It was suggested that this heater might have been an extra on vehicles that have the so-called “Winter Pack”. Such vehicles usually have two batteries, a heated windscreen, heated wing mirrors and heated seats. However, these extras vary on different vehicles and it seems to me that the winter pack is a bit of a legend really! And on my Pajero I have two batteries plus this heated fuel filter head, but non of the other heated goodies which puts into question a generic winter pack even further.
Another theory was that the heated fuel filter head may have been fitted for Pajeros sold in the colder regions of Japan.
It all seems to me as though we’re simply looking at yet another Pajero optional extra. Regardless, my cold starts seem to be working out very nicely right now.