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how much hp will 3/8 fuel line handle? #604960 02/05/10 03:21 PM 02/05/10 03:21 PM
Joined: Jul 2007 Posts: 150 South Carolina, United States C carolinacuda OP member
carolinacuda OP member C Joined: Jul 2007 Posts: 150 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 03:52 PM 02/05/10 03:52 PM
Joined: Feb 2007 Posts: 5,080 organ M maximum entropy master
maximum entropy master M Joined: Feb 2007 Posts: 5,080 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 04:02 PM 02/05/10 04:02 PM
Joined: Sep 2005 Posts: 769 Europa, Estonia Georg super stock
Georg super stock Joined: Sep 2005 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 04:06 PM 02/05/10 04:06 PM
Joined: Jul 2008 Posts: 30,424 Florida STAYcation dOc ! The village idiot's idiot
dOc ! The village idiot's idiot Joined: Jul 2008 Posts: 30,424 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: dOc !] #604964 02/05/10 04:49 PM 02/05/10 04:49 PM
Joined: Apr 2005 Posts: 1,880 USA Ron Silva top fuel
Ron Silva top fuel 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: dOc !] #604965 02/05/10 04:53 PM 02/05/10 04:53 PM
Joined: Dec 2005 Posts: 1,495 Shelby mi. J JAKE68 pro stock
JAKE68 pro stock J Joined: Dec 2005 Posts: 1,495 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 04:59 PM 02/05/10 04:59 PM
Joined: Sep 2005 Posts: 769 Europa, Estonia Georg super stock
Georg super stock Joined: Sep 2005 Posts: 769 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 05:07 PM 02/05/10 05:07 PM
Joined: Jun 2003 Posts: 9,225 Charleston S sixpackgut Drag Week Mod Champion
sixpackgut Drag Week Mod Champion S Joined: Jun 2003 Posts: 9,225 Charleston	My friends have gone 8.20s at 3000lbs with 6an line Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram 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 05:37 PM 02/05/10 05:37 PM
Joined: Jan 2003 Posts: 11,705 Portage,michigan B B3422W5 I Live Here
B3422W5 I Live Here B Joined: Jan 2003 Posts: 11,705 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 05:42 PM. 69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, 10.40 @127 1/4 1.41 best 60 foot 6.60 at 103.90 1/8

Re: how much hp will 3/8 fuel line handle? [Re: dOc !] #604969 02/05/10 06:30 PM 02/05/10 06:30 PM
Joined: Jan 2003 Posts: 302 Casa Grande,Arizona D DennisJ super street
DennisJ super street D Joined: Jan 2003 Posts: 302 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 09:24 PM 02/05/10 09:24 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 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 10:03 PM 02/05/10 10:03 PM
Joined: Jul 2007 Posts: 150 South Carolina, United States C carolinacuda OP member
carolinacuda OP member C Joined: Jul 2007 Posts: 150 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 10:06 PM 02/05/10 10:06 PM
A Anonymous Unregistered
Anonymous Unregistered A	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 10:48 PM 02/05/10 10:48 PM
Joined: Jan 2003 Posts: 1,894 N of Detroit DaveDudek top fuel
DaveDudek top fuel Joined: Jan 2003 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 10:54 PM 02/05/10 10:54 PM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 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 11:00 PM 02/05/10 11:00 PM
Joined: May 2008 Posts: 1,131 Thigh-Gap Junction @ @#$%&*! New user name, Same old jerk!
@#$%&*! New user name, Same old jerk! @ Joined: May 2008 Posts: 1,131 Thigh-Gap Junction	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 01:13 AM 02/06/10 01:13 AM
Joined: Jan 2003 Posts: 10,766 Central Valley, CA. Quicksilver440 I Live Here
Quicksilver440 I Live Here Joined: Jan 2003 Posts: 10,766 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 02:04 AM 02/06/10 02:04 AM
Joined: Apr 2009 Posts: 228 northeast texas S strokin73cuda enthusiast
strokin73cuda enthusiast S Joined: Apr 2009 Posts: 228 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 02:40 AM 02/06/10 02:40 AM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 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 02:40 AM.

Re: how much hp will 3/8 fuel line handle? [Re: @#$%&*!] #604979 02/06/10 04:14 AM 02/06/10 04:14 AM
Joined: Aug 2003 Posts: 43,096 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,096 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 02:44 PM. Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

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