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fuel pressure question

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Old Oct 29, 2003 | 12:52 PM
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slow4.8's Avatar
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Question fuel pressure question

hey i have a 99 4.8 with all the mods listed in my sig. i have been told that the fuel pressure can be raised or lowered in stock form. my question is, would i see any gain in performance if i raised the fuel pressure or just leave it at 38 psi? thanks for all the help.
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Old Oct 29, 2003 | 01:49 PM
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Hit Man X's Avatar
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Originally Posted by slow4.8
hey i have a 99 4.8 with all the mods listed in my sig. i have been told that the fuel pressure can be raised or lowered in stock form. my question is, would i see any gain in performance if i raised the fuel pressure or just leave it at 38 psi? thanks for all the help.
Fuel pressure is ~56-60psi on these motors. Just leave it alone...it isn't worth messing with on these vehicles.
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Old Oct 29, 2003 | 03:47 PM
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Unless you have some way to see if you need more or less fuel I wouldn't mess with it.

You could always check and see if it helps by making a few runs on a dyno. Fuel pressure at WOT should be in the range Hit Man X said.
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Old Oct 29, 2003 | 04:36 PM
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ok, thanks guys for the info.
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