Hi, My w210 1996 E-300D is leaking diesel from the shutoff valve o-ring. Since you've experience, could you, please, tell me the step by step how to do it? I've tried to do it myself. But not knowing what between the shutoff valve and injector pump make me nevous. Can't see it on you photo either. Please help. Also what needed to be remove in order to be able to work on it? There simply no room. Please email me at lawesq@comcas.net THX