Fuel regulation questions

[Xavier]

I have a 140GPH electric fuel pump with a regulator mounted before the carburetor, I have a gauge mounted on the fuel line going to the Edlebrock carb. I have the fuel pump running off of a manual switch, which I do not know if it is a good or not good idea. When I have the fuel pump on, and the engine was not being turned over, it was at a too high 12psi. When the engine's ignition start running to be turned on the fuel drops to what I need it to 4 to 5.5psi. THis makes sense to me, because I understand that the fule line is building up with pressure, until the carb needs it and it is higher because there is no place for it to go, but I am afraid that once the carb goes to except the fuel as that there suddenly becomes too much to gulp down at a surge of 12psi. Make sense? Mine seems to be plumbed like everyone else's I see. I just want to make certain this is right. Not that familiar with carburetors and it does not seem right.