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5/16 fuel line for 500 hp? #719119
06/08/10 01:15 PM 06/08/10 01:15 PM
Joined: Nov 2003
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Ridgeland Wi
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mopars_1 Offline OP
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Ill try and explain my senerio.. Im restoring my 71 340 roadrunner for FAST style racing. My Roadrunner was in very original condition with fuel lines in very nice shape, but thay are 5/16. Would this be enough for say a 500 hp 416? 500 hp would probably be on the high end but who knows. any info will be appreciated!
-kevin

1971 Plymouth Duster 340 auto
1937 Plymouth PT50
1969 Dodge Dart Swinger 340 4 speed
2013 Ram laramie 2500 hemi
2008 Harley FLSTSB springer
Re: 5/16 fuel line for 500 hp? [Re: mopars_1] #719120
06/08/10 01:20 PM 06/08/10 01:20 PM
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organ
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maximum entropy Offline
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i've done it. i've done 600 with 5/16. put a fuel pressure gauge on it.

for what is the good life if not doing things thoughtfully?
Re: 5/16 fuel line for 500 hp? [Re: mopars_1] #719121
06/08/10 01:33 PM 06/08/10 01:33 PM
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communist bloc of new jersey
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jamesc Offline
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look at the fastest cars list, sixth car down in the eleven second bracket. that is dwayne porters satellite, it ran those numbers with a stock fuel line and mechanical pump. not sure if it was a stock pump it might have been a carter high volume.
Re: 5/16 fuel line for 500 hp? [Re: mopars_1] #719122
06/08/10 04:01 PM 06/08/10 04:01 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Quote:

Ill try and explain my senerio.. Im restoring my 71 340 roadrunner for FAST style racing. My Roadrunner was in very original condition with fuel lines in very nice shape, but thay are 5/16. Would this be enough for say a 500 hp 416? 500 hp would probably be on the high end but who knows. any info will be appreciated!
-kevin



I wouldnt stay with the 5/16... go 3/8 or bigger now
since you can... do you really think your going to
stay with the power you have now... no way
Re: 5/16 fuel line for 500 hp? [Re: MR_P_BODY] #719123
06/08/10 04:10 PM 06/08/10 04:10 PM
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Temperance, MI
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prochargedhemi Offline
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Ive been 10.70's with a 5/16 fuel line and a stock carter pump to boot, though it did go through the traps with 0 fuel pressure

Last edited by prochargedhemi; 06/08/10 04:10 PM.
Re: 5/16 fuel line for 500 hp? [Re: mopars_1] #719124
06/08/10 04:35 PM 06/08/10 04:35 PM
Joined: Jun 2003
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Romeo MI
MR_P_BODY Offline
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Here's why I say you should up grade... first in
reality you playing with 1/4" fuel flow.... next in
every bend you get 15% reduction unless you have some
aftermarket tubes with mandrel bends.... since you can
up grade why not... why chance going lean.... JMO
Re: 5/16 fuel line for 500 hp? [Re: MR_P_BODY] #719125
06/08/10 04:50 PM 06/08/10 04:50 PM
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Left Coast
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Quote:

Here's why I say you should up grade... first in
reality you playing with 1/4" fuel flow.... next in
every bend you get 15% reduction unless you have some
aftermarket tubes with mandrel bends.... since you can
up grade why not... why chance going lean.... JMO




You think like I do, Mike. The one thing that I have noticed in Mopar race sites like this one is the propensity for minimalism. Of course, not everyone is like this-not anywhere near the majority-but there are more Mopar racers this way than all the rest combined. 5/16" fuel line is inadequate for 500 horsepower-especially for racing situations.
Re: 5/16 fuel line for 500 hp? [Re: BobR] #719126
06/08/10 05:04 PM 06/08/10 05:04 PM
Joined: Jun 2003
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Romeo MI
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Quote:

Quote:

Here's why I say you should up grade... first in
reality you playing with 1/4" fuel flow.... next in
every bend you get 15% reduction unless you have some
aftermarket tubes with mandrel bends.... since you can
up grade why not... why chance going lean.... JMO




You think like I do, Mike. The one thing that I have noticed in Mopar race sites like this one is the propensity for minimalism. Of course, not everyone is like this-not anywhere near the majority-but there are more Mopar racers this way than all the rest combined. 5/16" fuel line is inadequate for 500 horsepower-especially for racing situations.



I guess that comes from working in the fuel lab for
35 years... LOL
Re: 5/16 fuel line for 500 hp? [Re: MR_P_BODY] #719127
06/08/10 05:12 PM 06/08/10 05:12 PM
Joined: Nov 2004
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Sunnyvale, CA
Jeepmon Offline
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The only question I have is... Does FAST allow for larger than stock fuel lines?

Somewhere (I'm sure someone will post a link to it) is a chart that shows the amount of fuel needed at HP levels.. and if I can remember, for a 500HP motor, you should be able to deliver 1 gallon of gas in 30 seconds..

With that said, for the first 3 or 4 years, I was running my 525HP motor with stock 5/16 fuel lines and the best volume I was able to obtain was 1 gallon in like 40-45 seconds..

I've since upgraded to a larger fuel line and if FAST allows you, you should upgrade also..

Good luck..

73 Duster 360 stroker
http://www.cardomain.com/ride/2594657
Re: 5/16 fuel line for 500 hp? [Re: BobR] #719128
06/08/10 05:43 PM 06/08/10 05:43 PM
Joined: Oct 2003
Posts: 7,506
Az
Crizila Offline
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Quote:

Quote:

Here's why I say you should up grade... first in
reality you playing with 1/4" fuel flow.... next in
every bend you get 15% reduction unless you have some
aftermarket tubes with mandrel bends.... since you can
up grade why not... why chance going lean.... JMO




You think like I do, Mike. The one thing that I have noticed in Mopar race sites like this one is the propensity for minimalism. Of course, not everyone is like this-not anywhere near the majority-but there are more Mopar racers this way than all the rest combined. 5/16" fuel line is inadequate for 500 horsepower-especially for racing situations.

on all counts!! Going lean can be a very costly scenario. Don't ask me how I know. Very strange to me why this web sight leans ( pardon the punn ) in that direction on this topic. Could it be a "misery loves company" thing?

Fastest 300
Re: 5/16 fuel line for 500 hp? [Re: Jeepmon] #719129
06/08/10 05:46 PM 06/08/10 05:46 PM
Joined: Nov 2003
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Ridgeland Wi
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mopars_1 Offline OP
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I will definatly look into this. Im still torn on using my original line or not at this point. also, even if I use a hidden electric pump, would that make a difference? I know FAST allows electric pumps as long as they are hidden. thanks!
-kevin

Quote:

The only question I have is... Does FAST allow for larger than stock fuel lines?

Somewhere (I'm sure someone will post a link to it) is a chart that shows the amount of fuel needed at HP levels.. and if I can remember, for a 500HP motor, you should be able to deliver 1 gallon of gas in 30 seconds..

With that said, for the first 3 or 4 years, I was running my 525HP motor with stock 5/16 fuel lines and the best volume I was able to obtain was 1 gallon in like 40-45 seconds..

I've since upgraded to a larger fuel line and if FAST allows you, you should upgrade also..

Good luck..


1971 Plymouth Duster 340 auto
1937 Plymouth PT50
1969 Dodge Dart Swinger 340 4 speed
2013 Ram laramie 2500 hemi
2008 Harley FLSTSB springer
Re: 5/16 fuel line for 500 hp? [Re: mopars_1] #719130
06/08/10 05:51 PM 06/08/10 05:51 PM
Joined: Oct 2003
Posts: 7,506
Az
Crizila Offline
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Go to BG's web sight. They have some info on this topic.

Fastest 300
Re: 5/16 fuel line for 500 hp? [Re: mopars_1] #719131
06/08/10 05:55 PM 06/08/10 05:55 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Quote:

I will definatly look into this. Im still torn on using my original line or not at this point. also, even if I use a hidden electric pump, would that make a difference? I know FAST allows electric pumps as long as they are hidden. thanks!
-kevin



If I recall Dave Dudek was running 3/8 on his.... also
I recall the HP cars ran 3/8 lines
Re: 5/16 fuel line for 500 hp? [Re: MR_P_BODY] #719132
06/08/10 06:10 PM 06/08/10 06:10 PM
Joined: Nov 2003
Posts: 3,106
Ridgeland Wi
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mopars_1 Offline OP
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hmm i was looking at my fuel line and it looked like 5/16. Ill have to get the drill bit out and find out. I read the rules and you are able to upgrade to 3/8's line

1971 Plymouth Duster 340 auto
1937 Plymouth PT50
1969 Dodge Dart Swinger 340 4 speed
2013 Ram laramie 2500 hemi
2008 Harley FLSTSB springer
Re: 5/16 fuel line for 500 hp? [Re: BobR] #719133
06/08/10 06:13 PM 06/08/10 06:13 PM
Joined: Feb 2007
Posts: 5,080
organ
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maximum entropy Offline
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Quote:



The one thing that I have noticed in Mopar race sites like this one is the propensity for minimalism.

my proclivity is to "leave bad enough alone". if my fuel pressure gauge indicates good pressure at the big end, should i "upgrade"? which is why i have always had a fuel pressure gauge in every car i've ever raced. it blows me away how many fast cars have no fuel pressure gauge in the cockpit. that's a critical parameter, imho. put a gauge in it!

for what is the good life if not doing things thoughtfully?
Re: 5/16 fuel line for 500 hp? [Re: maximum entropy] #719134
06/08/10 06:40 PM 06/08/10 06:40 PM
Joined: Jan 2007
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IN
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ahy Offline
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As another input, the factory upgraded to 3/8 on high po 440's and Hemi's running 375-425 HP. I believe some folks running modified Hemi's upgraded to 1/2". 5/16 may work but I would upgrade if possible. A nice pre-bent replacement line from inline tubes isn't terribly expensive. Its cheap insurance.
383man [Re: ahy] #719135
06/08/10 09:10 PM 06/08/10 09:10 PM
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Balt. Md
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383man Offline
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As others have said its best to step up to atleast 3/8 if the rules let you. My sons Dart has run 11.40's @ 117 with the stock 5/16 fuel line on it. We bought the 3/8 line 3 years ago and he has not put it on yet since it runs so good with the 5/16 line. His Dart does not lay over or feel like it is leaning out. I figure his 400 is making right around 475 to 520 hp. So in many applications 5/16 fuel line will support 500 hp but why take the chance if you can upgrade. Ron
Re: 383man [Re: 383man] #719136
06/08/10 10:35 PM 06/08/10 10:35 PM
Joined: Jul 2003
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upstate western ny
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Put a gage on it .. You need to b factory appearing


" 3.07 The correct* mechanical fuel pump must be retained.
3.08 Electric fuel pumps are allowed if mounted in a location out of view.
Fuel regulators and fuel pressure gauges are OK, if mounted in a location out of view.
3.09 Correct* fuel lines are required from engine mounted mechanical fuel pump to carburetor.
3.10 Fuel lines from tank to mechanical pump may be upgraded. "

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Re: 383man [Re: sogtx] #719137
06/09/10 07:00 AM 06/09/10 07:00 AM
Joined: Jan 2005
Posts: 866
Winnipeg ,Mb. CA.
chryco Offline
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Stay with 5/16" if you HAVE to , but bigger is really better. Well worth the effort to upsize.

Gas is fer washin' parts ....Alky`s fer drinkin' ...Nitro`s fer Racin'!

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