[Mr.Fixit]

Make sure the electric pump is on. You don't get vapor lock on electric fuel pumps, only mechanical pumps which are bolted to the engine and receive alot of heat soak. Is the pump "self priming" mounted lower than the gas level? If not, it only akes an air bubble to cause the pump to cavitate and not be able to pull fuel into it. You can hear if this is happening, the pump sounds different when there is no load on the impeller. What about your fuel filter. Make sure it's not full of debris. The needle and seat on the carb can stick and prevent fuel delivery. On a holley, just rap the top of the adjustement screw/ nut with your screwdriver handle, that usually works. Gas in the tank above the pickup, fuel pump mounted below fuel level, fuel pump running, no kinked hoses or blocked filters, is there pressure at the fuel line to carb inlet.