Hi I found some logs I did with my Delphi ds150e
max fuel pressure is 24098.045614417 PSI at 3084rpm ,at full boost
so you do have low fuel rail pressure, was your car in limp mode when you did the test?
some have used a after market fuel filter and it did fail soon after they fitted it,
I did have a crossland filter with no problem ,
now using Bosch,
can you look at the voltage of the low pressure pump at the fuse then at the pump when it is running, check you have full voltage with it running,
new pump, Dave
http://www.partsforvolvosonline.com/...oducts_id=4515