I agree, dead head style fuel systems are just plain stupid. Good for emissions, horrible for driveability. What you are describing is one of the downsides of a dead head fuel system. The car wouldn't do it with a return system because the fuel i the rails would always be cool, fresh and at a constant psi.It had something to do with the design of the pump letting air bubbles into the mix. Once they replaced my pump I've not had the issue even once.