The fuel pump relay should be under the drivers seat. I have never changed one out, but I would imagine it would involve buying a new one, unplugging the old one and plugging in the new one. Sounds relatively simple, but once again, I have never done it so I am not sure if anything else is involved. Have you pulled your codes? If it is the relay or the pump, I would think you would have codes.
Caymon
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'90 GT Under construction
Best E.T. = Fast @ High Speeds - OK So I Lie. So What!!!  
04 F-150 STX 4.2L 5 spd
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