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ECU (Engine Control Unit) relay, fuel pump relay and oxygen sensor heater relay are located in the under-hood E-Box. The E-box is under the large black plastic cover at the passenger side rear of the engine compartment.
I do not have the 740IL manual, but generally the fuel pump relay is either on the right side in the trunk above the battery or behind the glove box. (there is usually a little card indicating which relay it is)
if its the lift pump in the tank your refering to and you have checked the relay is not burnt out then the sender unit itself needs to be replaced in the tank
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