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

fuel pressure

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Old 08-16-2010, 10:18 AM
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what should fuel pressure be on a 97 z28 mine is 42 at idle but drops to 35 when I rev it up Car has lost power I have replaced the opti and intake gasket
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Old 08-16-2010, 11:58 AM
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~43.5psi key on, engine off, then it should drop 3 to 10psi with the engine running and slowly increase with throttle position.
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Old 08-16-2010, 01:18 PM
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It has 43 idling and will drop to 37 reving it.Its backfiring at low rpm and has no power
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Old 08-16-2010, 01:24 PM
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37 is low. It should go up when revving, not down
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Old 08-16-2010, 02:23 PM
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Unplug the fuel pressure regulator and see what it dose
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Old 08-16-2010, 02:30 PM
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Originally Posted by idformula
Unplug the fuel pressure regulator and see what it dose
Likely the same thing. Sounds like the pressure regulator crapped out.
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Old 08-16-2010, 02:37 PM
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it doesnt change much when unpluged 1-3 psi
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Old 08-17-2010, 02:22 PM
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its possible the pump itself just cant keep up anymore.
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