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I'm not sure, based on your information, where exactly you are checking, and more importantly when you are checking. The fuel pump relay is controlled by the DME and provides power to the fuel pump. Unlike other cars the DME on turns the fuel pump relay on when the car is cranking or running. If you just put the key in the "on"position, the fuel pump doesn't get power. Disconnect the cable at the fuel pump (under the battery tray). Hook up a light or a voltmeter to the bigger tabs on either side of the connector and crank the engine. If you have voltage there when you're cranking then it's not the relay or DME signal.
If you don't have power there then you should pull the pump relay out and test that. 12V applied to the 2 small prongs should result in a click sound.
There are 2 different power supplies that you have to consider here. There is power from the electrical distribution system that goes through the fuse, the relay and to the pump to power it. The second power supply comes from the DME to turn the relay on and off.
If the relay is working, and there are no blown fuses, and you're not getting power to the pump when the car is cranking, then it's an issue with the DME. In that case you're going to need to take it to a shop or someone with diagnostic gear. One possible problem is that you have a fault in your alarm module that would tell the DME that the car is being stolen, in which case the DME will turn off the fuel pump.
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