Please help with this issue I've had for the last month now.
It's my '83 300D - 250,000 miles, glow plugs are new & light works correctly. I've used biodiesel for the last few years. My friend needed the bio more since his commute is much longer & since I have 3 fellow carpoolers which pay me to drive - so I have been using straight dino diesel for the last month.
Since switching back to diesel it is harder to start - have to give it slight throttle & idled rough. The rough idles has since been fixed after I rebuilt the injectors - idles great & runs great now - after sitting anyway.

The problem is that after the car has run & shut off like going to the store & come out - it will not restart - no throttle, part throttle, full throttle - it doesn't matter, it acts as though it's flooded. Let it sit 4-5 hrs & it starts right up.
Just now we went back to Starbucks to pick it up after the last incident last night. It started immediately. I let it only run only for ~20 seconds. We went in & had a coffee & then it would not re-start. So it's still there & it will start fine tomorrow morning.
I work 12 hr shifts & it is fine at work since it sits so long but around town on my off days & for my wife & kids forget it.
Please - any suggestions?
Thanks,
Mike