What happens when the fuel pump relay is off?
What happens when the fuel pump relay is off? When the fuel pump relay is off (not activating the fuel pump), the high current circuit is ‘open’. In it's ‘open’ state current does not get sent to the fuel pump. The low current circuit is the control circuit that ‘closes’ or ‘opens’ the high current circuit. Why does my Ford pickup have a green relay? You'll be able to find out if the fuel pump relay, or the fuel pump Inertia Switch, or the fuel pump is the cause of the No Start Condition on your Ford car or pickup....