What's this... Why is that??

[JayDub]

I have just found same on mine;
its been smelling of neat diesel for about 2 weeks now, after a run to/from work (6 miles) it would stink !! when retuning to car theres a pool of diesel, thought it may be leak-offs but they are ok ?
so gets in from work tonight, same smell of diesel around so I took the intercooler off, but didn't disconnect the pump boost pipe---instead I spun the intercooler around while attached so I could see injectors/pipework.
after seeing its bone dry, I moved the intercooler and neat, clean diesel started running out of where the boost pipe attaches---removed the intercooler at this stage and drained about an egg-cup of fuel out of it.
the pipe to the injection pump is filled with diesel, so the diaphragm on the boost compensator is split..........bummer !
I have plugged the pipe and also the pipe on inter-cooler where it used to be attached to until I can locate a new diaphragm.

in retrospect his also explains why about a month ago, the car put the shits up me by accelerating while I was going around traffic island on a dual carriageway, pouring out loads of black smoke and had the worst diesel knock ever !!!!------when cornering the neat fuel has slopped to one side in the intercooler and been sucked in.....

Mine isn't showing any misbehavior but I suppose that's what I should expect mine to eventually do then, What effect does disconnecting this hose have then? any short or long term damage, decrease in power or MPG? Can I just get a replacement boost compensator (breakers?) and bolt it on or is it less simple than that