I have this '89 240DL SW since mid 1990. 8 months ago it died while I was driving and it turned out to be the main fuel pump was bad. At least seems that way after the pump was replaced with an after-market NAPA part. In two month after that, I started have this intermittent no-start problem.

At first, I checked to make sure the fuel system was good and sparks was there. All seems okay. But it would not start still. I could wait 15-45 mins and eventually it would roll over and started. This was getting worse now that I could spend more than a couple hours trying and it still won't start. It just keeps on cranking. Checked both engine control module and emission control module according Bentley book, couldn't anything wrong. I got battery replaced 2 months ago but that did not fix the problem. May be a little better first not that case anymore. I even tried to remove negative battery terminal after I got it started to see the alternator working ok, it seem no problem even battery disconnected after start. I can start once in a while but never predictable base on weather, temperature, humidity or any environmental factor.

Interesting thing is if I get it started and driving, it will not die (at least has not yet) on me until I shut it down and try to restart it. A lot of times, no start.

Any one has any idea what could be not working?

Thanks you.

CJC147