yeah, time to invest in the fuel pressure gauge...
Fuel pump was replaced only a couple of years ago; luckily have records for this car. Are these pumps known failure items?
Before I get the gauge on it, is a 'manual' test at the schraeder valve of any value?

__________________
'83 300 SD
'05 E320 4Matic
'06 BMW 530 xi
'68 Triumph TR 250 - The only car I ever loved more than the Mercedes; who needs electricity, anyway? - Damn, why did I sell it?!
'59 Jaguar 3.4 'Le Chat Noir' - Damn, why did I sell it?!

It's difficult to make predictions, especially about the future.
- Niels Bohr