4. This is the beauty of the Edelbrock Sump Kit: The fuel is supplied by your existing mechanical fuel pump already mounted on your block. Fuel is supplied to the sump at 7 psi, just as it would your carburetor. The sump admits and cuts flow into the tank with a pre-adjusted float, needle, and seat, just as your carb would. Just as a carb’s float bowl does, the sump’s capacity easily covers any temporary drop-out in fuel delivery, only for a much longer period of time.