Please help if you can.

I have a 1986 190E, 8V that will not start.
When I turn the key the fuel pump no longer makes a sound before the engine starts, which made me suspect a bad fuel pump.
I tested the fuel pump and it is not receiving any power when the ignition is turned on, so the pump is not the problem.
Next I looked at the Fuel Pump Relay, there were no obvious signs of carbon build up or corrosion on the relay, I then jumped the 87 & 30 terminals which should force power to the fuel pump, and still got no power to the fuel pump.
I also inspected the Over Voltage Relay, and it also appears to have no problems.

Question, what do I look at next?
Is there a fuse that could be preventing power from reaching the relay; is there a main power source that I can check, is there a common ground wire that would cause this problem?

All help is appreciated.

Todd