Are you saying the car is not running now?
I guess I need a refresher on the symptoms. From the original post I thought this to be a time dependant reoccuring happening. If instead it has degenerated into a continuous condition that isn't fuel pressure related, one needs to tell if the injectors are openning and if the ignition is firing. You might look at a spark plug and see if it is fuel soaked.
If it were a plain no start I would also be sure of your key. Try another.
Bosch Master, ASE Master, L1
33 years MB technician