Tried 3 sets of injectors now. All seem to spray nicely but leak when the system is pressure(pump running).
Since I can't see all the injectors being goosed, I'm wondering if the fuel pressure is too high?
New fuel pressure regulator fitted but then I suppose that's been lying on a shelve for donkeys years.
Nothings been tampered with on the fuel distributor but I'm wondering if old age or a knackered sensor/wire could cause it allow excess pressure.

Trailer job to a decent tuner methinks but a pita as certainly none that could be called local:-(