Cab`s right.........I don`t remember the exact numbers but my flow #`s went WAY up by adding a second filter but have since dumped the frams and use a Mallory 500 series canister filter. Somethings not right and like stated, I would disconnect the fuel lines at the carb and see how many seconds it takes to flow a gallon......it should be around 20-25 seconds I would think at your et. Good luck.