There is a test port on the fuel rail for checking pressure and flow...

Next time it fails to start, give the OVP a few taps..

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=2AO123CS42EB0RZRTB&year=1995&make=MB&model=C-220-001&category=P&part=Overload+Relay

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A Dalton