[JAM1775]

Sounds like the accel pump. You may need a bigger squirt or perhaps just check your pump levers and make sure they are adjusted to specs. My Demon actually required a slight gap while my new Holley requires a zero gap. If you hold the bottom nut and go counter clockwise on the top one you will tighten the pump which should deliver the squirt on call. ..instead of waiting for your motor to pull down the fuel .
Edelbrock is 800-416-8628.