C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
Sponsored by:
Sponsored by:

Fuel Pressure

Thread Tools
 
Search this Thread
 
Old Aug 2, 2009 | 11:33 PM
  #1  
76yellow's Avatar
76yellow
Thread Starter
Burning Brakes
20 Year Member
Liked
Loved
 
Joined: Jul 2004
Posts: 783
Likes: 38
From: Mankato Mn
Default Fuel Pressure

How much fuel pressure should I have at the carb. I'm running a 396 with a Q-jet. I only have 1 1/2 lbs at the carb. Is that to low ?
Reply
Old Aug 2, 2009 | 11:36 PM
  #2  
midyearvette's Avatar
midyearvette
Le Mans Master
Supporting Lifetime Gold
 
Joined: Nov 2008
Posts: 5,691
Likes: 12
From: columbus oh
Default

Originally Posted by 76yellow
How much fuel pressure should I have at the carb. I'm running a 396 with a Q-jet. I only have 1 1/2 lbs at the carb. Is that to low ?
yes that's too low.....should be 5-7 lbs.....
Reply
Old Aug 3, 2009 | 12:17 AM
  #3  
76yellow's Avatar
76yellow
Thread Starter
Burning Brakes
20 Year Member
Liked
Loved
 
Joined: Jul 2004
Posts: 783
Likes: 38
From: Mankato Mn
Default

Thanks midyear. I appreciate your help !
Reply
Old Aug 3, 2009 | 09:10 AM
  #4  
Mike Ward's Avatar
Mike Ward
Race Director
10 Year Member
 
Joined: Jul 2001
Posts: 15,892
Likes: 42
Default

If you're measuring the pressure with one of those little inline gauges from Jegs or Summit, please take a rock and smash it. None of them work properly.

Does your car run OK? Close the hood and forget about it.
Reply
Old Aug 3, 2009 | 09:22 AM
  #5  
08vycpe's Avatar
08vycpe
Burning Brakes
 
Joined: Jun 2008
Posts: 1,086
Likes: 1
From: Michigan
Default

You should see 5 1/2 to 6. If the pressure is above 6 you run the risk of flooding and stalling per my Edelbrock carb owner's manual.

In addition to pressure you should check for flow rate per instructions in the service manual.

How's the fuel filter?
Reply
Old Aug 4, 2009 | 01:09 AM
  #6  
my.yellow.74's Avatar
my.yellow.74
Instructor
 
Joined: Apr 2009
Posts: 186
Likes: 0
From: Pensacola Florida
Default

Originally Posted by 08vycpe
You should see 5 1/2 to 6. If the pressure is above 6 you run the risk of flooding and stalling per my Edelbrock carb owner's manual.

In addition to pressure you should check for flow rate per instructions in the service manual.

How's the fuel filter?
Don't know if you've solved the prob but also check your fuel line for any kinks to reduce you pressure. I agree gauges are only as good as the builder . I bought one from harbor freight and everything was off. Good luck
Frank
Reply

Get notified of new replies

To Fuel Pressure





All times are GMT -4. The time now is 08:42 PM.

story-0
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-1
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-2
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-3
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-4
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-5
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-6
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-7
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-8
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-9
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE