LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

fuel pressure?

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Old Apr 8, 2003 | 11:03 AM
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ericz28w's Avatar
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Joined: May 2002
Posts: 166
From: elbert ,colorado, USA
Question fuel pressure?

what is the normal psi for my car?
thanks
Old Apr 8, 2003 | 11:20 AM
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Injuneer's Avatar
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From: Hell was full so they sent me to NJ
Turn the key on, don't start the engine: 43.5psi, +/-2.5psi, so 41-46psi is OK

Start the engine, pull the vacuum line off the FPR: 41-46psi

Engine running, replace vacuum line: 35-38psi (can be higher if you live at a high elevation, or if you have a radical cam with little vacuum at idle.)

WOT: Pressure should return to the "no-vacuum" value, and stay there.

As you drive: Pressure will fluctuate between the values with the vacuum line off and on, depending on throttle movement (vacuum)

Last edited by Injuneer; Apr 8, 2003 at 11:22 AM.
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