Ok, do this systematically and remember, there is an ELECTRIC component that may be malfunctioning sitting in 15 galons of gasoline back there. Snake your hand to the back of the pump and yank it's harness off. Stick a pair of long wires and energize the key as you check the voltage. If there is still no voltage, the relay is under the driver's seat. If you are supplying voltage and no pump operation, get that thing out of there! Test it out of the car. Hook up the pump out of the tank and try and get it to run.
To verify proper relay operation, there is a wire in the EEC harness that, if grounded will run the pump nonstop. I think it is the last wire opposite the test connector (or something like that, I havent had an eec in years non). It's used for testing things such as what you are encountering.
Heck, if it doesnt work now, how much reliability can you expect out of it in the future?
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