Electric fuel pump

[joemama16341]

I just swapped to a predator 420cc clone engine. I drilled the valve cover and put a barb in it for the pulse line. I have great pulse through the new fitting but I am not getting much fuel. I can only run wide open for about 20 sec before i empty the fuel filter and have to let it idle to refill. I am thinking about replacing fuel pump with an electric on. The local advanced Auto has an inline electric pump that is 2 - 4 psi is this big enought or am I asking for other problems trying to swap this out. I am looking for advise pls