I have a '78 T/A and I want to put the standard Quadrajet back on it but I can't get it to stop flooding. I put a pressure gauge on the pump outlet and at cranking it gives peak pressures of slightly over 10psi, it is a new standard pump. I have connected an airline to the fuel inlet of the carb (on the bench) and the needle valve will not seal at 10psi, it will only work up to about 7. I have tried combinations of 2 seats and 2 valves, all new, and none of them will seal. There is no mention of a pressure regulator in the books and I have never seen a caburetted car with one. Please can someone tell me what I am doing wrong.
TIA,