Honestly I don't think psi has totally been proven to not cause leakage out of the injection pump, and I thought they talked about it being too high of pressure on the return side. My lift pumps are set to 9 psi. One lift pump runs all the time, and the other turns on at 15 psi of boost. I have a lift pump pressure gauge in my truck and it fluctuates. At idle it's at 6psi. Then slowly on the throttle it drops to 4, Then a little more it goes up to like 7. And then on the throttle enough to build boost and it stays right at 9-9 1/2. I think as long as your hpfp has pressure and doesn't drain out of fuel you'll be ok. Obviously you don't want to be ridiculous on the pressure if it isn't needed. My question to you would be what model pump do you have. And do you have a flow chart showing what your pump flows for the psi you want to run. I know my pumps supply my hpfp with x amount of fuel at x psi, from looking at the charts.
The airdogs I believe are rated 165 gph at 0 psi. So if you set it at 10psi like everyone says, or its max rating, what it is really flowing. Gph goes down as psi goes up. So I'd find what that flow rating is. kind compare it to what your pump flows at x psi, because we know the airdogs maxed out on psi still flows enough fuel for these trucks
