quick fuel

Well i have been beat down on my 600 vs Holley,never had this problem ever.when i barely move the throttle no gas from the nozzle after half way fuel.I have rebuilt Holley for years and never had this problem adjusted the pump shot,change pump cam,every thing looks right so i give up.SO TIME FOR A NEW CARB what is your thought on the quick fuel 600 carb.#25 nozzles tried 31 nozzles pink cam