I have to replace a leaking injector seal on my 1.6 diesel and need to depressionize the fuel system can't figure out whether it's a mechanical lift pump or electric pump and if it's electric can't find a fuse any ideas please

 

If your only removing an injector turn the ignition off and let the car stand for 2 minutes to be on the safe side and the rail pressure should be zero then remove the high pressure pipe from the common rail to the injector. A scan tool is a good instrument to see what the rail pressure is. When their running their around 40,000kpa and start bleeding down as soon as the engine stops. Most are capable of reading it even a cheap generic tool should display the pressure. As an added precaution just put a rag over the fitting as you undo it and if your got sensitive skin a good set of rubber golves. Dermatitis loves Diesel fuel.
Oh I forgot to mention you must replace the copper sealing washer or it most likely will leak compresion. Also make sure you remove the old one.

 

Many thanks, now at the point of taking oit the injecter, the slide hammer I bought doesnt seem to have anywhere to fit to, but after cleaning best I can I can feel slight movement when I wiggle it with a screwdriver.

 

Taking injectors out can be a chore. Take your time and just wiggle.