found the problem part
My car stalled again. Tapping on the fuel pump didn't help. Than I tapped on the fuel pressure regulator and the car started right up. I did this 3-4 times when the car stalled. I am thinking that the fuel pressure regulator was possibly causing a too high or too low pressure at the fuel line that was making the car stall.
If anyone knows a way to fix the fuel pressure regulator please help me out.
1989 230E, 8v, 166.000 km, updated to 94/95 trunk & hood
2002 Daewoo Nexia 50.000 km
1987 VW Jetta GLE 16V, Recaro seats
1982 Volvo 240 DL (lovely car!)
and few more american cars.