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Message: <blockquote data-quote="Paul" data-source="post: 633020" data-attributes="member: 9404">Huh? Why is that?Anyway, normal factory is 39psi with the vacuum disconnected. Per what has been said above, at part throttle, the computer will attempt (within given parameters) to adjust the amount of fuel that gets injected in order to meet an air/fuel ratio target. However, at wide open throttle, the computer resorts to pre-programmed fuel "maps" and doesn't continually adjust pulsewidth. Higher fuel pressure in this scenario would ultimately mean more fuel, and to an extent, maybe more power depending on what AFR you're at when WOT. However, it's been my experience that the WOT maps are more rich than your normal burbling-around-town AFRs.Long story short, you can try it. It doesn't hurt and the cost is relatively low. That said, there is definitely other stuff you can spend your money on first.Paul.</blockquote>