Fuel pressure - is this normal

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Jul 22, 2002 | 11:50 AM

Viprklr

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From: N. Illinois

Car: 92 GTA/ 00 TA

Engine: 383/350

Transmission: 700R4/T-56

Fuel pressure - is this normal

At idle in park my car reads 43 psi.
In drive and stopped the pressure drops to 39.
At cruise the pressure hangs at 39 but sometimes hits 40.
At roughly 1/2 throttle to WOT the pressure increases to 43.

Is it normal to get only a 4 psi difference in pressure?

I have the L98 auto

Jul 22, 2002 | 07:26 PM

BOTTLEDZ28

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From: Mass

Engine: 350 TPI

Transmission: A4

Axle/Gears: 3.23

what kind of gauge are you running. mine reads 43 at idle and goes to 49 at WOT. thats with an AFPR though. mechanical gauges give the best reading with fuel pressure.

Jul 22, 2002 | 07:33 PM

Ed Maher

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From: Manassas VA

Car: 04 GTO

Engine: LS1

Transmission: M12 T56

Fuel pressure should vary directly with manifold vacuum. You should get max pressure at 0 vacuum (WOT, or with vac line disconnected at regulator), lowest pressure during idle/light cruise/decel. If thats not what you are seeing, something is wrong with your regulator or the vacuum line is connected to the wrong source

Jul 23, 2002 | 11:10 AM

Viprklr

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From: N. Illinois

Car: 92 GTA/ 00 TA

Engine: 383/350

Transmission: 700R4/T-56

I'm running the electrical nordskog gauge.
stock regulator
vacuum hose at regulator connected to the plenum

It sounds like everything is working fine. I'm just questioning why my range from idle to WOT is only 4 psi. Could there be a problem I'm not seeing?