You were not told it was the CPS...you were told it was a possible..and I told you to test the old one BEFORE trowing more parts at it ..
I also told you to check the FP system and you didn't know where the test port was ..your answer was it was fine..well, if it is fine , tell me what the pressures were , both with reg/vac on and w/reg/ no vac.
You want answers,but we need info.
Go back to your last posting and you will see several people have tried to help you..
What were the results of the FP test...??? " it's fine " doesn't cut it... I mean what were the FP specs you found???
If your guy changed the FP, I have a feeling you have a fuel problem.
And if the guy can't find the k-40 relay, he does not work on benz
http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=2EI1B4MYE2EQ0OSQK8&year=1997&make=MB&model=E-320-002&category=P&part=Relay