My 2000 E 430 died on the freeway about 20 minutes after leaving work.

I had it towed to my driveway and the next day it started right up but quit after running about 20 minutes.

I changed out the Crankshaft Positioning Sensor as well as the fuel pump and fuel filter last year so I don't suspect any of those.

Any suggestions on what to try next?

As of this moment, it won't start, just cranks and stops.