Fuel can indeed go through to the turbo, and seep out the joins between the trousers and the turbo etc.
Check number 2 injector lead, by taking off and see if this cures it ?
If it does, did you or anyone else do any reapairs to the loom ?
I've only seen it once before, but when someone was taping up a ropey loom, they misplaced the iscv plug with the no2 injector plug, as they are the same length in the loom.
This resulted in the no 2 injector being pulsed continuously by the ecu thinking it was the iscv, which is pulsed continuously!!
tabetha