I have been having some running rich issues with my flathead lately and was stumped until I looked at my fuel pressure regulator I had set at 2lbs of pressure when I installed it. I noticed that my 1-4 lb regulator was pushing 9lbs ?? I tried to re-adjust it but no matter how far out I adjust it, it wont get below 4-5 lbs of pressure. I took it apart to see if the diaphragm had a piece of trash in it or something, blew everything clean and re assembled it. Hooked it back up and same problem. No adjustability. Im running a Stromberg 97 and a Carter fuel pump. I inspected both the pump and carb as well. The warranty on these from Summit is 90 days, so I'm SOL on that. Has anyone else had this problem?