1995 E300 Diesel shut off valve "weep"

[ftav]

Hi there. I hope someone can help me with this. I did a search for leaky shut off valves (atop the fuel filter assembly) and couldn't find answers to me specific problem. I just replaced my fuel filter and both the orings on the valve assembly and still have this persistent "weep" right under the "cap" of the shut off valve itself. After the car sits or even after it is driven, a small amount of fuel collects right on top of the 19mm "nut" portion of the assembly. In other words, the fuel seems to be leaking underneath the cap, or around the portion of the assembly which screws/turns into the assembly when you turn the valve to "stop". This leads me to believe that there might be a third internal oring which is ordinarily not replaced in normal service and my fuel is slowly getting around it to cause the leak. Either that or the new ultra-low sulfur fuel has different properties from which the valve was originally designed. Anyway, I was wondering if anyone ever experienced a similar problem and if you tried replacing the whole assembly. It is part # 601 070 05 46 and is about $90, so I'm loathe to replace it if it in fact doesn't do the trick and there is something else I should try. Then again, I'm thinking that maybe the part has been updated to reflect the different fuels of today so that might also be a help. Thx.