Been reading a lot on the Quadrajet as Im going to roll up the sleeves and try to tune mine. I needed a little help understanding where all the fuel comes from up to part throttle. So blades closed only my idle discharge hole (hole controlled by mixture screws) should be my only source of fuel ? Then confusion kinda starts As blade opens the off idle slot now provides fuel but is the idle mixture hole still providing fuel? And as i continue to open blades now the lower idle air bleed provides even more fuel but are the lower 2 still also providing fuel? Then i believe past this point the main system provides fuel through the venturies but are all the idle slots still providing fuel? Just tryin to wrap my head around what provides fuel or doesnt to zero in on tuning the carb.