When I was building my 427 many years ago I asked the same question. Somebody pointed out that my fuel pump was the same one used for the L-88. That was all I needed to hear. It's been more than adequate.
Input on BB fuel pump
Thread Starter
Burning Brakes
Joined: Jul 2013
Posts: 1,139
Likes: 82
Input on BB fuel pump
Currently getting ready to reinstall my LS5 engine back into the Vette...not sure if the stock mechanical fuel pump is sufficent for what I'm doing or if I need more flow-volumne.
The engine is close to stock other than a roller cam and three angle valve job/ cleanup here and there. I don't want to add a electric pump, trying to keep factory look.
The car will be used for street cruising-general performance driving. I guess my main concern is I don't want the engine leaning out do to lack of fuel.
Thanks, Kevin
The engine is close to stock other than a roller cam and three angle valve job/ cleanup here and there. I don't want to add a electric pump, trying to keep factory look.
The car will be used for street cruising-general performance driving. I guess my main concern is I don't want the engine leaning out do to lack of fuel.
Thanks, Kevin
Race Director
Joined: Dec 1999
Posts: 11,094
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From: Sierra Foothills CA
Melting Slicks
Joined: Mar 2005
Posts: 2,838
Likes: 10
From: Austin TX
I'll disagree. Maybe a stock fuel pump will be ok for mild horsing-around on the street use but if you do any extended Bonsia's, she'll starve. I tried a stock pump on a pretty mild 396 Camaro (about 450-475 HP,..Holley DP 800,..dual plane) and she couldn't make it down the 1320.
If you plan any track time go to something like this:
http://www.summitracing.com/parts/ed...maro/year/1969
I like this one,..110gph (a stock pump flows about 30gph if that) and it only has 6 psi which means it won't over-power the needle-n-seat(s) of your carb.
Here's some good info on fuel pump requirements:
http://www.onallcylinders.com/2013/0...ions-answered/
...basically, at 400 HP it's time for the upgrade IMO, plus it will help overcome the stock fuel system which can be restrictive.
If you plan any track time go to something like this:
http://www.summitracing.com/parts/ed...maro/year/1969
I like this one,..110gph (a stock pump flows about 30gph if that) and it only has 6 psi which means it won't over-power the needle-n-seat(s) of your carb.
Here's some good info on fuel pump requirements:
http://www.onallcylinders.com/2013/0...ions-answered/
...basically, at 400 HP it's time for the upgrade IMO, plus it will help overcome the stock fuel system which can be restrictive.
Last edited by 73, Dark Blue 454; Sep 13, 2013 at 12:10 AM.
Melting Slicks
Joined: Oct 2007
Posts: 2,310
Likes: 9
From: KB7TIF Ville NV
I replaced mine with a 110GPH mechanical, worked well.
Replaced with a high power electric with a bypass regulator, noticed instant improvement in throttle response, PITA to install buts its done.
Replaced with a high power electric with a bypass regulator, noticed instant improvement in throttle response, PITA to install buts its done.
Le Mans Master
Joined: Oct 2006
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From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
I must be doing something wrong. I'm running a crate LS-7. That's the 454/460 that was "supposed" to be in the 1970, but GM killed it. I've added more cam, aluminum heads, currently running an 850 Demon, and I've also had a 2x4 Edelbrock carb setup with the stock 427 fuel pump and never had a bit of problem. And that includes some extended 5500 to 6000 trips.
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Thread Starter
Burning Brakes
Joined: Jul 2013
Posts: 1,139
Likes: 82
Fuel systems and fuel flow is one of my weaker areas but I wonder if some of these cars in the 400 to 500 hp range (not running a rear electric pump) are a little short of fuel under a hard launch.
I'm going to run my engine on a dyno to check fuel pressure and AF ratio but in a car and under accelleration is very different.
Kevin
I'm going to run my engine on a dyno to check fuel pressure and AF ratio but in a car and under accelleration is very different.
Kevin
Melting Slicks
Joined: Mar 2005
Posts: 2,838
Likes: 10
From: Austin TX
Also, somebody above said their 'throttle response' improved by upgrading to a bigger pump. The pump has nothing to do with initial throttle response; the fuel credited for "throttle response" is already in the fuel bowl(s) of the carb.
Again, an upgraded pump will supply fuel long after a stock pump has peaked out,..usually 6-8-10-12 seconds of WOT.
FWIW
Race Director
Joined: Dec 1999
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From: Sierra Foothills CA
An inadequate fuel supply (pump) won't present itself in first gear. Run through the gears at 5500-6500 RPM for 12-13 seconds and see if she 'swallows the egg'. That's the only way to tell if your performance engine is receiving needed flow and PSI.
Also, somebody above said their 'throttle response' improved by upgrading to a bigger pump. The pump has nothing to do with initial throttle response; the fuel credited for "throttle response" is already in the fuel bowl(s) of the carb.
Again, an upgraded pump will supply fuel long after a stock pump has peaked out,..usually 6-8-10-12 seconds of WOT.
FWIW
Also, somebody above said their 'throttle response' improved by upgrading to a bigger pump. The pump has nothing to do with initial throttle response; the fuel credited for "throttle response" is already in the fuel bowl(s) of the carb.
Again, an upgraded pump will supply fuel long after a stock pump has peaked out,..usually 6-8-10-12 seconds of WOT.
FWIW
Melting Slicks
Joined: Jul 2001
Posts: 2,609
Likes: 12
From: Massapequa Park NY
Hasn't been a problem for me Jim
Race Director
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From: Taylor Michigan
I must be doing something wrong. I'm running a crate LS-7. That's the 454/460 that was "supposed" to be in the 1970, but GM killed it. I've added more cam, aluminum heads, currently running an 850 Demon, and I've also had a 2x4 Edelbrock carb setup with the stock 427 fuel pump and never had a bit of problem. And that includes some extended 5500 to 6000 trips.