Fuel cut off cellenoid.

Here is one for yas, on my Disco (2.5 tdi) my cut off celenoid was plying up, not starting etc.
So I bought me a new one and put it in like a month ago, but now it sems to not turn off without stalling it. If I adjust it a lil bit it will work for a few days then start with prob again, I tend to keep a 24 spanner with me at all times to either tighten it up or slacken it off every time it does it, but its only a tempory fix cause it will do it again a few days later. Anyone know of a perm fix for this ?. Would be apreciated if anyone has any advise.

dont know much about diesels, but maybe there's a loose wire somewhere. it almost sounds like the same thing that happens to my V8 every now and then, but my problem is on the ignition coil.

Thanks heaps, hopefully it is sorted now, only time will tell. Seems I was missing a lil rubber washer that goes on the ned of it. The new one from Lucas didnt have it on lol.