Thanks for that link, it should clear some things up for me.

On ‎2‎/‎13‎/‎2017 at 1:59 PM, JSM said:

After reading up on Fords Inertia switch, I will be using it in as a safeguard when installing Fuel injection in my 240z.

Haven't put it in yet (obviously), but...

Normal position with button pushed down (switch closed and the pump will run):

Give it a knock on the palm of the hand, and popped (button up):