Currently have a 502 MAG/EFI motor with a Whipple supercharger and a modified fuel delivery system engineered by the engine builder with advice from Whipple. The fuel line from the pressure relief valve goes back to the fuel filter. I have heard that the Ilmor marine engines do this. Lots of people don't think it's a good idea. I also heard about a kit that somebody makes for marine applications that allows the relief line to be routed back to the fuel filler hose. Anybody know who makes that product?