I went from a 2 bbl to a 4 bbl mercruiser q jet carb and a new intake manifold. Finally got the carb and im curious if anyone has a vacuum diagram for the carb. Thanks!
Boats do use a vacuum advance. You may not have a marine carb. There is a line from the fuel pump to the carb that is clear if that is what you are talking about that is for safety in case the diaphragm ruptures.