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Take the nut off and check the washers are clean. It takes very little debris to make a copper or aluminium washer leak. Tightening it more can stretch and even break the bolt underneath.
Your local hardware shop should have a selectin of fibre-washers, they don't look anywhere near as good but they do work well at stopping leaks on those type of joints.
That banjo fitting screws into the rear end of the fuel gallery in the injection pump. The line that goes upward carries the return fuel from the injectors (don't be fooled by the fact that it comes from atop the fuel filter - the filter is just used as a mounting point).
The other line is the return to tank - the excess fuel from both the fuel gallery and injectors return to tank and the banjo fitting is used to tee them together.
Just to be sure, check that the leak itn't running down from the injector return line - it is known that the line can crack between the pigtail and where it mounts on the top of the fuel filter.
I realise this is an old post but I just wanted to say thanks to all the contributors
Sounds exactly like the leak/drip that I have
Out of interest is there anything on the actual pump that is know to wear/deteriorate and leak other than the external pipe work ?
Regards
Phil
All the washers on my fuel pump are metal (Aluminium I think) with the rubber seal insert. Beware, some places can charge a fortune for these washers!
Pete.