Whats the age and condition of the glow plugs? That can also play a major role in how easy they are to start. If the fuel lines are old just get some line and replace some, its pretty cheap/easy to do. I did it about a year ago on my car, none were leaking yet, but they were old, now I don't have to worry about it with all new hoses on it.  Also replaced all my glowplugs last month when one of them fried.
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'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
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