[bobcowan]

It all depends on the fuel system you're using. Generally, the pressure regulater is simply a bleed valve. Think of it like a hole with a tapered rod. Turning the screw moves the tapered rod in or out, making the bleed hole smaller or larger.

When the pump is pushing fuel through the hole, pressurer will build up behind the bleed hole. When the pump stops pushing fuel, the pressure bleeds off.

Turn the key to Run and you'll hear the pump run. If the computer doesn't see any nrpm's after a couple of seconds it will shut off the pump. I have an A1000 pump outside the tank, so it's really easy to hear. Turn the key to Start before the pump shuts off. The pump should run while the engine cranks.