Delphi crd....prove the integrity of the spur gear/vac pump.(in line gauge back of pump)proof test it by restricting fuel line to see a good vac pressure/or pull if you like.
5/sec per division on pico time base(50 secs of time).
5 Volt scale/monitor the rail pressure sensor signal wire KOEO PLAUSIBILITY VOLTAGE/START/IDLE/FULL WOT/IDLE/OFF/DECAY.
Better still be ready with this test when fault occursuse a 2sec per division if you wish.
the IMV on pump controls volume of fuel which has direct effect on pressure generated. Don't forget the 'time'it takes to generate pressure correctly is within 1 second...you may 'see' your fault when in non start situation.
IMV can be prone to sticking!
Not a scope guru but r&d and learning.
Above may not be right totally stand to be corrected.
HTH
Simon
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