98 model LS1, factory dual fuel line setup (one pressure and one return), and a walbro pump fro Allen. The 86 was a diesel with dual tanks. Can I just keep the factory switch in the dash and at the tanks, and use the vent line as a return? Then splice the walbro in line. Will that work or is there more to it? If this will work, whats the best way to regulate the pressure? Or is the walbro already at the right pressure? Thanks