Fuel delivery???
Since I bought it used I'm not positive. I thought he said it was the higher pressure one but It don't go over 7 psi on my gauge so it might be the lower one. I think that's all you need anyway. They're both rated at 120 gph just the one is higher pressure and like Redfastback said if you go too much they'll start to push them off the seats and flood out.
Sorry about the handle screw-up redfastback. Got it corrected now.