tough one for sure
new pumps , but do they meet the specs needed for this fuel system , do they have a check valve, are the lines connected correctly at the accumulator ( we have had some on here that messed up the plumbing  )
injectors come to mind also , leaking, especially the cold start injector. If the rest pressure is going down you are loosing fuel somewhere or it is returning to tank
rest pressures are a start , we need to somehow get run pressures
I guess leak down could occur at FD
some more reading
K-Jet.org | K-Jet Debugging Guide
http://www.volvoclub.org.uk/tech/fuel_injection/BoschMechanicalFuelInjection.pdf
__________________
Ron
2015 Porsche Cayman - Elizabeth
2011 Porsche Cayman - Bond,James Bond
Sadly MERCEDESLESS - ALways LOOKING !
99 E320 THE Queen Mary - SOLD
62 220b - Dolly - Finally my Finny! Sadly SOLD
72 450SL, Pearl-SOLD 
16 F350 6.7 Diesel -THOR
19 BMW X5 - Heaven on Wheels
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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