Re: Question on loosing fuel pressure going down track.
 

It is a Summit -8 inline 40 micron filter

Re: Question on loosing fuel pressure going down track.
 

Won’t be G forces.

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.

Jim Mantle V/SA 6632

Re: Question on loosing fuel pressure going down track.
 

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)

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?

Re: Question on loosing fuel pressure going down track.
 

I just did now im right at a gallon in 60 seconds. That was tested using line right at carburetor

Re: Question on loosing fuel pressure going down track.
 

On a free flow test it should be a gal.in 30 seconds especially with a Q-jet...gsa612

Re: Question on loosing fuel pressure going down track.
 

Should pump a gallon in 30 seconds. I think you just found your problem.

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 .

Re: Question on loosing fuel pressure going down track.
 

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 ;-)