I have a '93 325i (E36/M50) and the fuel pump relay is a 5 pin, light green in color located in the front slot in front of the tall DME Main Relay.
Front of Car <<<< Fuel Pump Relay.......DME Main Relay.......O2 Sensor Relay
Second row of 6 relay slots
Third Row of 6 relay slots
Left Front Fender/Driver Side/ Looking Down into Fuse Box