Gav,
I have the stock fuel pump in the tank as supplied by GM. Mine is a simple setup where by fuel comes from tank pump and is parallel with the fuel regulator before it passes through filter then to the rails. The regulator has a port to send excess fuel to the return line of the fuel tank. I also have all that other GM (pollution stuff) which is mounted on the fuel filler hose which incorp. the carbon canister & return fuel line routing. Got details if you need them.
I have not experience any fuel shortages or hunting when pushing it at winton so I guess it works fine
Leeroy.