It isn't very cold, it was in the 40's the morning she had trouble and I've tried it when it was much warmer.
The valve clearances were adjusted just a few thousand miles ago when replacing the valve seals.
I will keep the lift pump in mind, in case I need to get that deep. Since I smell the burned fuel from the exhaust I don't think this is the problem, but I'm not ruling anything out yet except the glow system.
It dawned on me when driving in this morning that I noticed the fuel guage was pegged out FULL. She must have topped it off and driven straight home. Then it would not start. I expect that she either got a bad tank of fuel(which I doubt because I've driven well over a half million miles in Benz diesels and have never gotten a bad tankful) or she filled it with gasoline.
Thanks to everyone, and I will let you know what I find. In the interim, please don't hesitate to post any other suggestions/thoughts.
Have a great day,
'01 C Class, Six Speed
'84 Euro 240D, manual, 533K miles
'88 300E 5 Speed
'81 300D Daughter's Car
Over 800,000 miles in