Peter, is it possible to have a loss of pressure but no fuel coming out of the delivery ports (valve holders)? As invisik said, there is no fuel leaking on his IP.
The reason I ask, I have been having a nailing type of noise, its in cyl 5 as determined by loosening the lines at the Injectors but I have no leaks anywhere. At least nothing visible at all, not even a film of fuel anywhere.
And I swapped injectors around with no change. I was about to think its my IP, but if you say it is possible that a leak can occur to drop pressure, why doesn't some fuel leak out?

I would still agree that he should take the car back to the dealer and have them retorque the ports to the procedure that I use 30 NM then loosen, then back to 30, again loosen the third time go to 35 NM and its done. Right?

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!