range rover 2.5dse injector pump leaking

hi my range rover has developed a leak on the diesel pump it seems to be covered in diesel under the black electrical box bit on the side of the pump but it could be running to there from somewhere else is this a common problem? an is there a place they normally leak from???????????

Check that nothing has come loose, other than that it's pump off and overhaul.

checked if anythink was loose and couldnt find anything and i didnt really want to take the pump off does anyone no if the black box bit on the side of the pump that the electric plug goes to comes off???? and if so is anythink likely to spring out or anythink as i studyed the pump today an im 99% sure its coming from behind it please someone help i need to use the car on thursday for a long trip

can anyone help please?????????????