Thanks for the great advice. I was thinking about a Holley pump. The one I saw indicated it was 3 - 7 PSI. It's interesting that you used a separate switch. I envisioned switched by the ignition, but I could see if you had the ignition switch on without the truck running, flooding could occur. I could also see, at my advanced age... that I could leave a separate switch on.. and cause the same issue. Did you use a block off plate to remove the old mechanical pump?