I own a 99 C280 Sport with 75k on it. The car will die after about 15 minutes of running. The vechicle will re-start after another 15 minutes of sitting. When the vechicle will not re-start there is not any voltage at the fuel pump, also there is not any spark. There are not any codes at this time. I am a Chrysler tech I have known that the when the cam sensor or crank sensor fails there will not be any voltage at the pump. Reading all the posts I have seen alot about this OVP relay. Will this relay cause no spark & no voltage at the fuel pump? Also where is this relay located & is there a way to diagnose if the relay is at fault.