Originally Posted by
Leva
I had a similar problem with my pump overpowering the vette regulator/filter. Was showing varrying fuel pressure from 70 psi at idle to 62 psi under load. I ended up tunning around it by chaging my min/max fuel pressure and adjusting the flow rate table by calculating injector flow rate per fuel psi. I used a stock 08 vette tune with my swap that had a 58 psi flow rate across the board, which is what the vette regulator should be governing to. My situation is more complicated then yours, as i swapped an l92 escalade motor into a stick shift car. Used the vette tune as a base and had to retune ve and maf, as they were way off due to the different cam profiles. Your swap sounds like a simple plug and play with the ls3 crate. Easiest fix would probably be to just install a regulator on the rail and ditch the other one, if fuel pressure is indeed the problem.