I recently installed a return style fuel system: Fore hat, twin walbro 342's, -10 supply and -8 return lines, Fore rails and regulator. After tuning, I datalogged the fuel pressure and it is solid through all rpms. When starting the car you have to crank on it longer than normal to get it to start. One thing I noticed when I shut the car off is the fuel pressure drops to zero in a few seconds. I thought the walbro pumps had a one way check valve to hold fuel pressure when you shut the car off? Is this normal or do I gave a problem?