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i use an electric fuel pump on my 91 idi 7.3. i cannot find what the pressures should be for such a pump. i plan on buying a new pump and stowing it in the tool box, just in case.
I just bought a small pump to feed my big pump that I think would work perfectly for you. It's a Carter hi-po series pump that puts out 72gph at 6 psi. Cost about $50 through Summit. Part #P4070