The OVP relay is not a likely problem in a no-start on your car. Some of the other symtoms could be attributed to OVP but the KE system does just fine warm without OVP - VERY GOOD limp home characteristics.
I would look to the fuel pump relay. But look is what you need not a crystal ball. You need to find what is missing.
Bosch Master, ASE Master, L1
33 years MB technician