Fuel Pressure Adjusting

AIbandit · Jul 25, 2012

Hi I have an 89 5.0 I was wondering what my fuel pressure should be at idle and various rpms.

I have afr heads, rpm II intake, ecam ,24lbs injectors 75mm maf, and tb. Shorty headers.

Thank you for your help

May of been sent from my G2, Expect errors.

elarm1 · Jul 26, 2012

I have mine set at 40 at idle on my aeromotive adjustable fpr if that helps

Gearbanger 101 · Jul 26, 2012

It's generally acceptable to have the fuel pressure set between 38-42psi with the vacuum line "off". It should read approximately the same at all RPM. If you're stabbing the pedal hard and it's dipping far below the recommended levels and is unable to, or having trouble recovering, you may have a weak, or undersized fuel pump.

The stock fuel pump is only rated at 88lph and will often become inadequate when big horsepower mods are performed.

MFE92 · Jul 26, 2012

I thought the spec was for vaccuum line off

Gearbanger 101 · Jul 26, 2012

MFE92 said:
I thought the spec was for vaccuum line off

Sorry....yes, you are correct. Vacuum line off and plugged. A misstype on my part.

AIbandit · Jul 26, 2012

Thanks, I think my BBK FPR was bad when I pulled it there was fuel in my vacuum line and when I put a stock one on I went from 15 to 20+ mpg

Fuel Pressure Adjusting

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Fuel Pressure Adjusting

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