What else can one say. Fuel pressure is all you get from fuel pumps. But fuel pressure does not come from the pumps. It comes from the regulator.
I had a 380SL about 6 months ago that had the internal feed to the tank output plugged and fuel couldn't be pumped fast enough. This can not be guessed at. You need to test pressure. If its alright when the car dies or won't run, then go somewhere else.
Bosch Master, ASE Master, L1
33 years MB technician