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Old 01-22-2020, 10:39 AM   #21
Jeff Stout
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Default Re: Question on loosing fuel pressure going down track.

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If you are using a fuel filter, check the Microns.
It is a Summit -8 inline 40 micron filter
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Old 01-22-2020, 11:37 AM   #22
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Default Re: Question on loosing fuel pressure going down track.

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1.88 60ft 14.50 ET.
Won’t be G forces.
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Old 01-22-2020, 04:34 PM   #23
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Default Re: Question on loosing fuel pressure going down track.

Have you checked the pressure before the regulator? Most pumps put out about 15 PSI.
You may have a low pressure pump not designed to use with a regulator or the pump is no good.

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Old 01-22-2020, 07:02 PM   #24
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Default Re: Question on loosing fuel pressure going down track.

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Side note is the o2 is going from 13.5 to 11 in high gear.
Trust the sensor, there isn't a problem. Its 11:1 in high gear. My cars AFR gets leaner as RPM increases an gets richer at each shift. (completely different carb)
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Old 01-22-2020, 07:20 PM   #25
MRE 7171
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Default Re: Question on loosing fuel pressure going down track.

Jeff did you get a chance to check the volume in a fuel jug for 60 seconds at the front of the car and what volume did you get?
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Old 01-22-2020, 07:45 PM   #26
Jeff Stout
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Default Re: Question on loosing fuel pressure going down track.

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Jeff did you get a chance to check the volume in a fuel jug for 60 seconds at the front of the car and what volume did you get?
I just did now im right at a gallon in 60 seconds. That was tested using line right at carburetor
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Old 01-22-2020, 08:12 PM   #27
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Default Re: Question on loosing fuel pressure going down track.

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I just did now im right at a gallon in 60 seconds. That was tested using line right at carburetor
On a free flow test it should be a gal.in 30 seconds especially with a Q-jet...gsa612
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Old 01-22-2020, 08:14 PM   #28
Danny Ashley
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Default Re: Question on loosing fuel pressure going down track.

Should pump a gallon in 30 seconds. I think you just found your problem.
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Old 01-22-2020, 08:25 PM   #29
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Default Re: Question on loosing fuel pressure going down track.

Its weird that the O2 sensor goes rich , sounds like some work needs to be done to straighten out the fueling of the carb . That being said the carb is using more fuel than can be supplied to it , so the pressure drops . My recommendation is to figure out what's up with the carburetor , but also make sure your fuel system is up to the task . My Q-jet is fed from a BG400 pump through a dash 10 line , and stays right at 6.5 psi throughout the run . Dyno pulls show the A/F ratio varies from 12.8 at 5000rpm to 12.4 at 7400 rpm .
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Old 01-22-2020, 09:25 PM   #30
Mark Yacavone
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Default Re: Question on loosing fuel pressure going down track.

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Should pump a gallon in 30 seconds. I think you just found your problem.
Agree..I've had cars under 25 sec.

BTW, I was just giving Jeff a hard time. Sorry some of you missed this whole sordid tale, for 5 years ...Check out the build section once in a while ;-)
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