Hello RedRooster                              I have no Idea I fitted it as most moderns have them I think and Nick said the fuel gets warm when the tank is low as it is going around the system and collecting heat when under the bonnet! If I remember right it is fitted in the return line! but then again it maybe in the flow line I will look (if I remember) I think it is a Bosch one as fitted to Diesels and cheap! Roger