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I believe your car does not have a seperate fuel pump relay. The relay is built-in to the CCRM (Constant Control Relay Module) for the fuel pump on 4.6L SOHC 2V engines. The 4V engine has a seperate relay.
Have you checked it with a scanner to see if it's throwing any codes? Unfortunately and fortunately there's not much to the circuit. It pretty much comes down to the pump itself, the CCRM, or the PCM.