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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 08-06-2014, 08:35 AM   #1
Force4
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Default Fuel Pressure to hi?

Hello Gents, trying to solve a tune issue. I have extremely rich readings on my holley 770 street avenger. At WOT with the factory Jets it would drop down to 10.9 at WOT and cruising (around 12-13a/f). After dropping the jets to 70's I still get rich readings. but its a tad better... I am questing if my Mechanical fuel pump upgrade is creating high fuel pressure appose to it being a jetting issue. I went from the factory 40gph to a 110gph mechanical pump but I have no regulator. Is this most likely my issue? I am going to pick up a fuel gauge after work but I want to get some opinions on this.
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Old 08-06-2014, 09:11 AM   #2
88 orangepeel notch
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6 to 8 psi is what I always went by for carbs. The GPH ratings sound like a lot without a regulator in line. You almost tripled the flow rate. I'd be curious what psi is when you check it. I'm guessing " excessive " lol.
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Old 08-06-2014, 09:23 AM   #3
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Well this is my exact pump:

http://www.cjponyparts.com/edelbrock...2-351w/p/FP15/


It says it does not require a regulator and only outputs at 6psi. Hrmmm Maby back to jetting...
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Old 08-06-2014, 09:47 AM   #4
88 orangepeel notch
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Hmmm, maybe I've been away from carbs too long lol. I'm curious as to how it can flow that much more without an increase in pressure. Fuel line dia. being the same. Post back when you find out the psi. Good luck
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306 with all bolt ons, letter cam, ported E7's, T5 swap, full exhaust, 3:55's, 2" drop, and the worst paint you'll ever see or feel.
Dyno'd 300/316, 2745lbs-track scale
Best ET………12.4@108, 1.66 60ft on 8" ET Drags.
24 mpg (combined)
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Old 08-06-2014, 09:47 AM
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