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how much hp will 3/8 fuel line handle? #604960
02/05/10 02:21 PM
02/05/10 02:21 PM
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South Carolina, United States
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carolinacuda Offline OP
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carolinacuda  Offline OP
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South Carolina, United States
I've had a few tell me I may not have enough fuel for my car. My 74 cuda with 440 has 530ish Hp. I run a holley black pump with a regulator at carb which is an 850. no return. I doesnt stumble nor seem to fall on its face so i havent paid much thaught to it. My 1/4 mph is usually between 117-118mph.

Re: how much hp will 3/8 fuel line handle? [Re: carolinacuda] #604961
02/05/10 02:52 PM
02/05/10 02:52 PM
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Posts: 5,080
organ
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maximum entropy Offline
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organ
i have 3/8 at 650 hp, with a carter mechanical race pump. my pressure gauge hardly drops at all during a run, so i couldn't tell you how close i am to the limit w/my combo. put a fuel pressure gauge in it. then you know.


for what is the good life if not doing things thoughtfully?
Re: how much hp will 3/8 fuel line handle? [Re: maximum entropy] #604962
02/05/10 03:02 PM
02/05/10 03:02 PM
Joined: Sep 2005
Posts: 769
Europa, Estonia
Georg Offline
super stock
Georg  Offline
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Posts: 769
Europa, Estonia
3/8 line 400hp max
1/2 line 600-700hp max
5/8 line 900-1000hp max
Up to about 400-500hp or with mechanical fuel pump you can use the single line dual feed kit, after that HP range or with any electric pump and regulator a line from each of the two ports should be run to each bowl of the carb and also these lines mast be as short as possible


Outlaw Plymouth Valiant R5/P7 Powered by Liuzzo Racing COMP Performance Group dealer in Baltic Premium Performance
Re: how much hp will 3/8 fuel line handle? [Re: Georg] #604963
02/05/10 03:06 PM
02/05/10 03:06 PM
Joined: Jul 2008
Posts: 30,632
Florida STAYcation
IcorkSOAK Offline
Financed his waterbed
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Florida STAYcation
Yet ANOTHER fuel-line topic ...

A stock 5/16 line will handle most any 10 second car ..

And a 3/8 line will handle THE FASTEST car on this board.

Re: how much hp will 3/8 fuel line handle? [Re: IcorkSOAK] #604964
02/05/10 03:49 PM
02/05/10 03:49 PM
Joined: Apr 2005
Posts: 1,880
USA
Ron Silva Offline
top fuel
Ron Silva  Offline
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Joined: Apr 2005
Posts: 1,880
USA
Quote:

Yet ANOTHER fuel-line topic ...


And a 3/8 line will handle THE FASTEST car on this board.




That's why I have a 1/2" line on my car!


SRT DEMON ONE SEAT
Re: how much hp will 3/8 fuel line handle? [Re: IcorkSOAK] #604965
02/05/10 03:53 PM
02/05/10 03:53 PM
Joined: Dec 2005
Posts: 1,495
Shelby mi.
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JAKE68 Offline
pro stock
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Shelby mi.
Quote:

Yet ANOTHER fuel-line topic ...

A stock 5/16 line will handle most any 10 second car ..

And a 3/8 line will handle THE FASTEST car on this board.



I agree. Ron Mancini went 8.90@148 in a 3600lbs. car with 3/8 fuel line and 2 small carter fuel pumps. Spent over $1000. on new fuel system and never went any faster. To go that fast computes to over 900hp.


JAKES AUTOMOTIVE
Re: how much hp will 3/8 fuel line handle? [Re: Ron Silva] #604966
02/05/10 03:59 PM
02/05/10 03:59 PM
Joined: Sep 2005
Posts: 769
Europa, Estonia
Georg Offline
super stock
Georg  Offline
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Europa, Estonia
Quote:

Quote:

Yet ANOTHER fuel-line topic ...


And a 3/8 line will handle THE FASTEST car on this board.




That's why I have a 1/2" line on my car!



Same here. Dont want to risk...


Outlaw Plymouth Valiant R5/P7 Powered by Liuzzo Racing COMP Performance Group dealer in Baltic Premium Performance
Re: how much hp will 3/8 fuel line handle? [Re: Georg] #604967
02/05/10 04:07 PM
02/05/10 04:07 PM
Joined: Jun 2003
Posts: 9,225
Charleston
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sixpackgut Offline
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Charleston
My friends have gone 8.20s at 3000lbs with 6an line


Gen 3 power 6.22@110, 9.85@135
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performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs
Re: how much hp will 3/8 fuel line handle? [Re: JAKE68] #604968
02/05/10 04:37 PM
02/05/10 04:37 PM
Joined: Jan 2003
Posts: 11,807
Portage,michigan
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B3422W5 Offline
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Portage,michigan
Quote:

Quote:

Yet ANOTHER fuel-line topic ...

A stock 5/16 line will handle most any 10 second car ..

And a 3/8 line will handle THE FASTEST car on this board.



I agree. Ron Mancini went [Email]8.90@148[/Email] in a 3600lbs. car with 3/8 fuel line and 2 small carter fuel pumps. Spent over $1000. on new fuel system and never went any faster. To go that fast computes to over 900hp.





i have been telling people stuff like this on here for years..i threw a bunch of money at my fuel system( to upgrade from a holley black) going high 9's at over 3350 pounds and didnt see squat.After listening to everybody tell me my system was woefully inadequate.
High buck fuel systems for a 500-750 horse car is the biggest waste of money on the planet, easily

i think most 9-11 second car owners on this board must own stock in magnafuel, as they all seem to run their 1200-1500 dollar setups on cars that in no way need them( na)

Last edited by B3422W5; 02/05/10 04:42 PM.

69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight
418 BPE factory replacement headed stroker, 565 lift solid cam, footbrake street/strip car

1.41 best 60 foot
6.54 @ 105.20



Re: how much hp will 3/8 fuel line handle? [Re: IcorkSOAK] #604969
02/05/10 05:30 PM
02/05/10 05:30 PM
Joined: Jan 2003
Posts: 302
Casa Grande,Arizona
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DennisJ Offline
super street
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Joined: Jan 2003
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Casa Grande,Arizona
Right on Doc. I had a bent 5/16 line that I think was smashed with a floor jack. The car still ran 11.86 @ 116.

Dennis Jokela


I started out with nothing,and I still have most of it.
Re: how much hp will 3/8 fuel line handle? [Re: DennisJ] #604970
02/05/10 08:24 PM
02/05/10 08:24 PM
Joined: Oct 2003
Posts: 7,506
Az
Crizila Offline
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Crizila  Offline
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Az
www.barygrant.com has got a ton of good info on this topic. Basically, their "fuel Can Test" pretty much makes the line size / pump size topic a moot point. It's based on how many seconds it takes to fill a 1 gallon gas can. Example: If you have a 10 second car, you will need enough fuel ( at the carb ) to fill a 1 gallon fuel can in 25 seconds. Smoking is prohibited while running this test


Fastest 300
Re: how much hp will 3/8 fuel line handle? [Re: carolinacuda] #604971
02/05/10 09:03 PM
02/05/10 09:03 PM
Joined: Jul 2007
Posts: 150
South Carolina, United States
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carolinacuda Offline OP
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Joined: Jul 2007
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South Carolina, United States
Thanks for your input guys. I feel a little better bout this. Now time to spend money else where!!!

Re: how much hp will 3/8 fuel line handle? [Re: carolinacuda] #604972
02/05/10 09:06 PM
02/05/10 09:06 PM

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Anonymous
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Anonymous
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It's amusing to see guys with 318's running fuel logs, big electric pumps, etc...

Re: how much hp will 3/8 fuel line handle? #604973
02/05/10 09:48 PM
02/05/10 09:48 PM
Joined: Jan 2003
Posts: 1,894
N of Detroit
DaveDudek Offline
top fuel
DaveDudek  Offline
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Posts: 1,894
N of Detroit
I have one stock 5/16 fuel line feeding both carbs. 10.35@134.4 and 770HP on the dyno..


Dave Dudek
1st Factory Stock legal car in the 10`s!!! [/b]
FAST & Factory Stock Rules: www.fastraces.org


FAST 69 Hemi RR 9.98@139
Re: how much hp will 3/8 fuel line handle? [Re: carolinacuda] #604974
02/05/10 09:54 PM
02/05/10 09:54 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Romeo MI
Quote:

Thanks for your input guys. I feel a little better bout this. Now time to spend money else where!!!




Remember that most of the carbs are running a .110
needle and seat per float(some are only a single .110
needle and seat).... alot of times you would be better
to go up in the needle and seat size as in a .120 or .130
If you can jet up enough to slow the car down(MPH)
you are getting enough fuel... if it does slow down
when jetting up I would change the needle and seat
first before buying a pump or changing fuel lines
but bigger will NEVER kill your engine like a lean
condition will

Re: how much hp will 3/8 fuel line handle? [Re: Crizila] #604975
02/05/10 10:00 PM
02/05/10 10:00 PM
Joined: May 2008
Posts: 1,131
Thigh-Gap Junction
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@#$%&*! Offline
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The problem with this method (BG below) is it totally ignores the weight of the vehicle. Here's a test I plan to preform someday soon: Take fuel bowls off carb and put them in cans and turn on the fuel pump and see just how much the pressure drops at maximum float drop.

Quote:

...barygrant...has got a ton of good info on this topic. Basically, their "fuel Can Test" pretty much makes the line size / pump size topic a moot point. It's based on how many seconds it takes to fill a 1 gallon gas can.



Re: how much hp will 3/8 fuel line handle? [Re: @#$%&*!] #604976
02/06/10 12:13 AM
02/06/10 12:13 AM
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Posts: 10,766
Central Valley, CA.
Quicksilver440 Offline
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Central Valley, CA.
Quote:

The problem with this method (BG below) is it totally ignores the weight of the vehicle. Here's a test I plan to preform someday soon: Take fuel bowls off carb and put them in cans and turn on the fuel pump and see just how much the pressure drops at maximum float drop.

Quote:

...barygrant...has got a ton of good info on this topic. Basically, their "fuel Can Test" pretty much makes the line size / pump size topic a moot point. It's based on how many seconds it takes to fill a 1 gallon gas can.







What does the weight of the vehicle have to do with it?

Re: how much hp will 3/8 fuel line handle? [Re: Quicksilver440] #604977
02/06/10 01:04 AM
02/06/10 01:04 AM
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Posts: 228
northeast texas
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strokin73cuda Offline
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northeast texas
Quote:

Quote:

The problem with this method (BG below) is it totally ignores the weight of the vehicle. Here's a test I plan to preform someday soon: Take fuel bowls off carb and put them in cans and turn on the fuel pump and see just how much the pressure drops at maximum float drop.

Quote:

...barygrant...has got a ton of good info on this topic. Basically, their "fuel Can Test" pretty much makes the line size / pump size topic a moot point. It's based on how many seconds it takes to fill a 1 gallon gas can.







What does the weight of the vehicle have to do with it?


The heavier the car is the more HP it needs to make the car go down the track at a given ET wich means more fuel. The can test leaves to many variables, maybe a very rough baseline at best.


496 stroker,Indy srs , new best 6.87 @ 98 1.46 60'
Re: how much hp will 3/8 fuel line handle? [Re: strokin73cuda] #604978
02/06/10 01:40 AM
02/06/10 01:40 AM
Joined: Jan 2003
Posts: 27,421
Balt. Md
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383man Offline
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Balt. Md
5/16 fuel line on my sons Dart and 3/8 on my 63 because I hope to go faster with my 63 some time down the road. Both run 11.40's without all the fancy fitting and we run the red Holley pump. Ron

Last edited by 383man; 02/06/10 01:40 AM.
Re: how much hp will 3/8 fuel line handle? [Re: @#$%&*!] #604979
02/06/10 03:14 AM
02/06/10 03:14 AM
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Posts: 43,909
Bend,OR USA
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Cab_Burge Offline
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Joined: Aug 2003
Posts: 43,909
Bend,OR USA
[quote] The problem with this method (BG below) is it totally ignores the weight of the vehicle. Here's a test I plan to preform someday soon: Take fuel bowls off carb and put them in cans and turn on the fuel pump and see just how much the pressure drops at maximum float drop.
Fuel pressure has nothing to do with how much volume the system will support, if you do that test and you have any pressure at the gauge you need bigger fittings, lines or needles and seat <img src="/ubbthreads/images/graemlins/scope.gif" alt="" />As MrPbody already pointed out, the real test of any fuel system(on gasoline) is to be able to fatten the mixture up enough so you can slow the car down by having the mixture to rich. I have seen some very knowlegable racers find out that they had enough fuel to run low nines at 148.7 MPH on squeeze but not enougn fuel delivery(volume) to go any faster. This particular racer jetted his carb up 10 jets sizes in 5 stages(two sizes at a time on all four jets) and the car ran within 1/4 MPH in the 1/4. It didn't miss, it didn't burn up any spark plug ground electrodes or hurt any parts. He added another pump, line and regulator and jetted it back down to the beginning jetting and the car pickup .22 ET and three MPH (151.6)on the first run. He jetted it up two sizes and went faster, he tried another two sizes and slowed down a tiny bit, he went up another two sizes and slow down two MPH <img src="/ubbthreads/images/graemlins/1343795-scratchchin.gif" alt="" /> It pays to test <img src="/ubbthreads/images/graemlins/thumbs.gif" alt="" />

Last edited by Cab_Burge; 04/12/21 01:44 PM.

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