6.1 fuel system help

58.5 psi is hemi factory, give or take. 58.5 psi is what the corvette filter/regulator delivers. It works as a deadhead system, so you can put the filter/regulator in the back and only run the single 3/8" to the front. That, with a 255 lph fuel pump (internal or external), supports up to about 600 fwhp. The external walbro is a gsl392.

Another thing to keep in mind- fuel injected motors don't take well to uncovered fuel pickups. Most factory EFI tanks have baffling and some sort of sump, so it's best to do something to maintain an adequate fuel level at the pickup. The style of driving will determine what is needed as well. Some guys can get away with a gsl392 with the factory pickup and keep the tank full enough, but I wasn't willing to stay above half a tank all the time.

My solution initially was a carter 6 psi 100gph pump from the tank to a fuel accumulator, and then a walbro gsl392 from the accumulator to the fuel rails. My power plans have changed, so now all of that is for sale and now I've got a sump, a1000 pump and regulator, aftermarket fuel rails, and a return style lines.