Is 8 psi fuel pressure too much for an edelbrock carb? - Vintage Mustang Forums
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Old 07-21-2004, 02:33 PM   #1 (permalink)
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I put on a new carter fuel pump, since the holley pump went out on me and left me stranded, and it registers 8 psi at the carb. I that good or too much for a edelbrock, or even a holley carb for that matter? I have a regulator that I can use if this pressure is too high.
The carter pump flows 120 gph and was 22 bucks at summit.
I am still playing with carbs, and I currently have a 750 edelbrock on it.
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Old 07-21-2004, 03:19 PM   #2 (permalink)
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High? Yeah. Too high? No.
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Old 07-21-2004, 05:35 PM   #3 (permalink)
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With the Edelbrock you can get by with the 8 psi. It's more forgiving in that regard.

But if you switch to a Holley style carb, 6.5 tops.
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Old 07-21-2004, 11:29 PM   #4 (permalink)
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aactually the e-brock and carter carbs are designed to run at around 5-6 psi, so 8 is way too high, i would regulate it down to 5 if you already have the regulator anyway
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Old 07-21-2004, 11:58 PM   #5 (permalink)
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Quote:
aactually the e-brock and carter carbs are designed to run at around 5-6 psi.......
You're right about the "designed" part.

But....I ran an Edelbrock 750 for some time with 8.5-9 psi fp. I assumed that my Carter street pump was putting out what it was spec'd at (6 psi). After I switched to a Holley style carb and installed a fp gauge, I found out the pressure was too high and was causing some float issues with the new carb. Although the higher pressure didn't have an effect on the E-brock, the Holley didn't like it that high.

So, now I run a reg at 6.5.

As always, others may have different experiences.
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