1985 BMW 735 not getting fuel

i have asked questions concerning my car before but as of late i have found out the reason it has not been starting is because it is not getting fuel to the fuel rail, im sure it is the fuel pump because it does not come on while the car is being cranked over and there is no fuel coming through the main fuel line but i dont know where the fuel pump relay is in case it is just the fuel relay can anyone help me find the relay thanks