| The "base" fuel pressure is 43.5psi (3bar). This is the fuel pressure required at 0psi of manifold pressure. For each psi increase or decrease in manifold pressure from 0psi, the fuel pressure must also rise or fall by that same amount. Example:
At idle, the manifold vacuum is about ~-6psi. Your fuel pressure at idle should be ~38psi. At 10psi of boost, your fuel pressure should be at least 53.5psi. (add 10psi to the base fuel pressure) At 20psi of boost, your fuel pressure should be at least 63.5psi. and so on and so forth for any given boost pressure. These are the bare minimum fuel pressure values for given boost pressure but you will usually find that the fuel system in our cars works a little better and you'll see a couple of psi higher than the minimum. You also have to test the fuel pressure all the way to redline as the fuel system wont always show a weakness through midrange RPM. Based on the linearity of your fuel delivery once it settles, I'm not so inclined to say your fuel system is the problem though, but it should still be tested.
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