Ok, recently the management light came on with the dreaded "anti pollution fault". After some diagnostics I turned out th fuel rail pressure was low thus indicating a leak. No leaak seemed apparent as the engine was clean, no smell of hot diesel and no loss in engine power, so I disregarded this as a duff fuel rail pressure sensor. It's been a Month or two now and I have noticed liquid around the injectors of cylinders 3 and 4 which is dark and had solidified. I can only suspect this is fuel, but I can tell if its coming from the tube coupling or the injector itself. Any ideas?