I’m working on my Range Rover now just put a new fuel pump in to fix my fuel problem and it seems I have ran into another problem. With the inertia switch down the pump continues to pump fuel even with the key off. And then with the switch up there is nothing. I don’t know a whole lot about the inertia switch but I don’t think it should be supplying power to the pump at all times even with the car off? I know there is a constant supply of power because I currently have the tank out and tested it before putting it back in when I discovered the constant stream of gas

 

have you checked the fuel pump relay to make sure they are not failed in the powered position

 

Yes id io to the fuel pump relay under the passenger seat also. Check the gray and white wire if I remember correctly for constant voltage or if its been bypassed with a jumper. Stuck relay will do this also, its ihe silver one with a red stripe. Unplug it and see what happens.