Testing fuel system

why dont you just get a fuel pressure gauge? they are cheap and that way you know exactly what is going on. sounds like you are making this more difficult than it has to be. a stock pump is going to jump around anywhere from 3 to 6 . my system is set up like this..... fuel cell~filter~electric pump~regulator~pressure gauge~filter~carburetor. there is never any question what pressure i have and it is a solid 5.5 for my holley 650.