I think I have chased down the leak this time, seems it was one of the clips weren't fully home between the filter and the stop solenoid - I reseated them and it seems much happier.

I will at some point be looking to remove all of those filters and replace it with a single all in one DAF filter - has a primer, large filter as well as a water trap all in one. I will also be doing away with the stop solenoid (which is apparently part of the immobiliser) and be adding in an electric pump at the tank end.

The fuel lines are actually in a good condition, it seems that they have been replaced recently (before I got the car) as they are all clear with no yellowing at all, looks like they might have just replaced the lines rather than the O ring in the smaller filter which was leaking last time.

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UK spec Mercedes W210 E300 Turbodiesel wagon - OM606.962 with 722.6 transmission - rust free!