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I'll say it- 4 to 7psi is two much. Surprised you don't smell gas fumes as I had in the distant past with 3 to 7 psi. If you have a long run from tank/filter to the pump [like in a friends ODay] 4psi works well. I have an electric Facet 2-4psi and the fuel pressure gauge shows a fairly steady 2.5 -2.75 and the engine runs well. I 've always been told that the A4 carb only needs 1 or 2 psi. I have gone through three electric pumps in about 40 seasons. Never thought installed backups would be a concern, but I do have one stored on board.
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