Friend has a 79' 280zx, and has a fuel dumping problem. He replaced the vain air system and it didn't solve it. I need to know the specs on what the fuel pressure is at different RPM's. I believe that to be the problem, I know the pressure regulator is working, just don't think it's working properly. If anyone has the specs or any other suggestions, please let me know. Thanks guys, and if anyone is looking to get into racing, check out www.demonspeed.com, we've got a car for sale!!!