What about the KW screw, though? Has it been checked yet? It could really be the cause, and ignoring it could become very expensive!
. . . have you ever checked the timing
?
Or simply use VAGCOM to log the injection start values.
If something is jumping unexpectedly (and the pump and pressure relief valve must be working correctly!), that confirms the suspicion about the KW screw.
'The pump is not building up enough pressure, which means the injectors cannot spray fuel.'
> I'm getting a new pump tomorrow, and I should have my car back then.