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dont mind the green circles.
I am asking about the far right of the picture, the middle of the pic has like a "nipple" push down button.
What is it? what does it do?
the one on the left is the fuel inertia switch, it will shut off the pump in case of an accident, and the one on the right is the port for testing fuel pressure.
That there would be part of your alarm system. You'll want to hold that nipple down if ever reconnecting the battery or you'll knock your head on the hood from the shock of the sound