Fuel line and return size
#2438491
01/21/18 05:25 PM
01/21/18 05:25 PM
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Joined: Jan 2005
Posts: 4,446 Michigan
MarkZ
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OP
Worthy
Joined: Jan 2005
Posts: 4,446
Michigan
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Hey guys, I upgraded to a stroked 512 last summer and now I'm looking to upgrade the fuel line with PTFE braided stainless. Factory lines are 5/16" supply with a 3/16" return. Motor is pretty docile with having untouched Eddie heads and a 239 @ .050" roller cam in it. Future plans include pulling the heads off for CNC porting and a 600HP FiTech - won't be going beyond that, so room for upgrades beyond this level would be unneeded.
I was thinking 3/8" supply and 1/4" return. Opinions? Thanks guys!
1987 Fifth Avenue - 512/518/D60
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Re: Fuel line and return size
[Re: MarkZ]
#2438496
01/21/18 05:33 PM
01/21/18 05:33 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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When I build a return system I usually use the original supply as the return and upsize the new supply. So I'd got with the 3/8" supply and use the existing 5/16" as a return. You really can't go too big on the return, within reason in case some clown want's to mwntion 2" black pipe or some such silliness.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Fuel line and return size
[Re: MarkZ]
#2438497
01/21/18 05:34 PM
01/21/18 05:34 PM
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Joined: Jan 2003
Posts: 4,275 Morrow, OH
markz528
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master
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Posts: 4,275
Morrow, OH
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I would absolutely not use 1/4" retuirn. If you use 3/8 feed use the same for the return. Absolutely would make the return at least 5/16.
I am building a 69 GTX with a 505 about 700 hp. I am running 8 AN (1/2") feed and return. Aeromotive tech support agreed with these sizes.
67 Coronet 500 9.610 @ 139.20 mph 67 Coronet 500 (street car) 14.82 @ 94 mph 69 GTX (clone) - build in progress......
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Re: Fuel line and return size
[Re: MarkZ]
#2438591
01/21/18 08:18 PM
01/21/18 08:18 PM
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Joined: Aug 2011
Posts: 2,867 Pattison Texas
CSK
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master
Joined: Aug 2011
Posts: 2,867
Pattison Texas
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If using a high flow,volume electric pump I would use a 3/8 supply,3/8 return, that is how my car is, 5/16 is ok for EFI, because it runs a much higher pressure, but for a carb,3/8 would be better for a return, mine is carb for now.
1968 Charger COLD A/C Hilborn EFI 512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim 2020 T/A 392 Stock 11.79 @ 114.5
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Re: Fuel line and return size
[Re: MarkZ]
#2438650
01/21/18 09:37 PM
01/21/18 09:37 PM
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Joined: Jul 2011
Posts: 960 Chicago
PurpleBeeper
super stock
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super stock
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Posts: 960
Chicago
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I personally like the idea of using the stock 5/16" line as a fuel return. It's already there, well-routed & simple.
70 Roadrunner convt. street car
440+6, NOS, 4-spd, SS springs
'96 Mustang GT convt. street car
'04 4.6 SOHC, NOS, auto, lowered
"Officer, that button is for short on-ramps"
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Re: Fuel line and return size
[Re: MarkZ]
#2438736
01/21/18 11:11 PM
01/21/18 11:11 PM
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Joined: Jan 2005
Posts: 4,446 Michigan
MarkZ
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OP
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Posts: 4,446
Michigan
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I should have stated that I plan on using an in-tank pump like the Aeromotive 340 when I change over. I'm just not a fan of the under hood surge tank FiTech sells. It'll be a another season though before that happens. Just trying to get the lines in order this year.
Thanks for the input everyone. This forum has been invaluable to me over the years.
1987 Fifth Avenue - 512/518/D60
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Re: Fuel line and return size
[Re: JRs_Charger]
#2441503
01/27/18 02:37 PM
01/27/18 02:37 PM
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Joined: May 2005
Posts: 4,744 Florida
BDW
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master
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Posts: 4,744
Florida
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I have the 600 HP FItech, and an in tank pump, and use 3/8th line for both feed and return. The large return line seems to help keep fuel temps lower.
The 5/16 and 1/4 lines are a no go. I have exact set-up, 600 HP Fitech with Spectra tank with in tank pump. Added 3/8" line for feed and used existing 5/16" for return. Works perfectly. Curious why you say it's "no go"? Nice thing about Fitech is you can adjust the voltage to the fuel pump , PWM, to lower the fuel pressure if needed.
Last edited by cnxt; 01/27/18 02:40 PM.
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