Manual pump VS stock, does computer regulate fuel at pump?

Most fuel systems now run on a loop. The pump is either on when engine is running or off when it isn't. Imagine your fuel pump was a light bulb and you turned it off and on constantly....If you want to cause something electrical to fail, just keep powering it on and off constantly. Anyway it just has one speed, on. The computer just tells the injectors ( which are just like a solenoid) when to energize and for how long.
Excess fuel just goes back to the fuel tank. Not just one way like a carburetor system.