I’m needing some help in figuring out what will be the easiest way for my fuel system to support ~1000 rwhp on e85. This topic has likely been covered before, but the setup I currently have is a little bit different and I would like some opinions on the best route to take. The truck is a 2003 Silverado 1500 and the setup it currently has supports ~650 rwhp on e85. The stock 4.8 didn’t like that for very long so a new forged motor is about to go in. Anyway, the current setup consists of a stock fuel pump in-tank, a walbro 255 in-line coming on with boost via a Hobbs switch. The Walbro pump goes to the passenger fuel rail and the unused fuel goes back to the tank. This setup worked well at 650rwhp but I think it is about maxed out. Would I be ok just to switch out the in-line 255 with something like a magnafuel 4303 and leave the stock in-tank pump? I assume that I’ll need larger fuel lines, regulator, and new fuel rails to support the power. If you all have any suggestions on the best way to go for these, please let me know. Here are a few pictures of the current setup, thanks for the help! Happy Thanksgiving!

 

Ditch the stock pump, run dual walbro 450's, might even need 3?

Size larger fuel line wouldn't be a bad idea.

 

3 450's or 1 450 and 1 4303
-10 main to inline filter to Y to -8 feed rails to regulator -8 return
127 lb injectors or bigger. Probably 160's