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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Factory fuel pressure?

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Old Oct 7, 2010 | 07:03 PM
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Default Factory fuel pressure?
Everywhere I look I see a different factory fuel pressure, so does anyone no for sure? And also does the pressure stay the same if you unplug the vacuum line on the regulator?
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Old Oct 7, 2010 | 07:08 PM
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Factory fuel pressure with the vacuum compensation line disconnected should be around 43.5psi at idle (but between 41 and 47psi is withing GM spec). When you reconnect the vacuum line, the pressure should drop proportionally to manifold vacuum (6-8psi for stock cams, slightly less for larger cams).
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Old Oct 7, 2010 | 07:10 PM
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Mine is around 50 with the line disconnected. I have a factory freak.
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Old Oct 7, 2010 | 07:11 PM
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And where is the line at excatly?
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Old Oct 7, 2010 | 07:22 PM
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Originally Posted by ale76051
And where is the line at excatly?
Vacuum line? right on top of the regulator.

Schrader valve is in back of the fuel rail.

My stock fuel pressure is 43.7PSI with the vacuum line disconnected.
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Old Oct 7, 2010 | 07:24 PM
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It's the small vacuum line attached to the fuel pressure regulator.
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Old Oct 7, 2010 | 07:25 PM
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Ok found it just as you posted back
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Old Oct 7, 2010 | 07:25 PM
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Is it ok to drive with it disconnected?
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Old Oct 7, 2010 | 08:36 PM
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There's absolutely no reason to drive with it disconnected.
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Old Oct 7, 2010 | 09:00 PM
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Ok, I heard to drive with it off from someone because I've been havin some crazy problem with it
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Old Oct 7, 2010 | 09:07 PM
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Originally Posted by ale76051
Ok, I heard to drive with it off from someone because I've been havin some crazy problem with it
What problem are you having with it? 0_o
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Old Oct 7, 2010 | 10:19 PM
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On long trips it will just die, no signs/symptoms and won't fire back up for 10-15 minutes. But if I wait for about an hour it will act like nothing ever happened
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Old Oct 7, 2010 | 10:34 PM
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Ok, so what's your fuel pressure? Do you want help or not?
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Old Oct 7, 2010 | 10:40 PM
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With the vacuum disconnected it stays at 42psi. I've already replaced the fuel pump and got the ltcc setup. When it acts up in these cooler nights it will just turn off, but in hot weather it will miss and smoke before it dies, and happens more frequently
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Old Oct 7, 2010 | 10:42 PM
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Sorry to hear about your ltcc misfortune..
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Old Oct 7, 2010 | 10:47 PM
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Yep, bob hasn't been a big help either
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