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Based on the pic posted above I'd say that the green arrow is pointing to the OP sender.
Running all of the time, or running for the first 5-20 seconds after turning the key on?
If the ECU is behaving properly it should turn on the fuel pump when you first turn the ignition on, and keep it on for some set short period of time. After that time the ECU looks to see if there is a signal from the OP sender. If there is, then the pump stays on. If there is not, then the pump is turned off.
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