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is 3/8" fuel line too much ? #1339845
11/23/12 12:03 AM 11/23/12 12:03 AM
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Shelby, Ohio
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2abodymcodes Offline OP
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69 b-body with mostly stock 383. it will probably have around a 700 edelbrock carb.
Re: is 3/8" fuel line too much ? [Re: 2abodymcodes] #1339846
11/23/12 12:11 AM 11/23/12 12:11 AM
Joined: Jan 2004
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Today? Who Knows?
1_WILD_RT Offline
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Describe "To Much"

"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."
Re: is 3/8" fuel line too much ? [Re: 2abodymcodes] #1339847
11/23/12 12:13 AM 11/23/12 12:13 AM
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ahy Offline
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3/8" is great. OE would have likley been 5/16". The 3/8 line will have a bit less restriction and help reduce the possibility of fuel problems with todays gas which boils easier since its made for pressurized EFI systems.

For an even more robust setup, add a return line and use the "3 prong" filter which returns any vapor and some gas gack to the tank. 1/4" is fine for the return line.
Re: is 3/8" fuel line too much ? [Re: ahy] #1339848
11/23/12 12:28 AM 11/23/12 12:28 AM
Joined: Aug 2008
Posts: 242
midwest
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intragration Offline
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I have a mid '80s car that originally came with a carbureted V6 and I was surprised to see that it had 3/8" lines. Your 383 should like it. The only concern may be with the original sending unit, if it has smaller fittings. When I put 3/8" lines on my 'Cuda, I also put in a new sending unit. If yours was originally 5/16", you may want to check this out too.
Re: is 3/8" fuel line too much ? [Re: intragration] #1339849
11/23/12 12:45 AM 11/23/12 12:45 AM
Joined: Jan 2003
Posts: 2,502
Shelby, Ohio
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2abodymcodes Offline OP
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the sending unit is not an issue. i have not ordered it yet. thanks for the info.
Re: is 3/8" fuel line too much ? [Re: 2abodymcodes] #1339850
11/23/12 01:37 AM 11/23/12 01:37 AM
Joined: Aug 2003
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Bend,OR USA
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Cab_Burge Offline
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Quote:

the sending unit is not an issue. i have not ordered it yet. thanks for the info.

Don't forget that the size is the outside diameter, not the inside diameter My 1/2 inch aluminum line is a little over 3/8 I.D.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: is 3/8" fuel line too much ? [Re: 2abodymcodes] #1339851
11/23/12 01:51 AM 11/23/12 01:51 AM
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Lincoln Nebraska
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RapidRobert Offline
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Quote:

the sending unit is not an issue. i have not ordered it yet.

Actually finding a sending unit that reads correctly is going to be the main problem. Do your homework as there's been a ton of issues with them. With your eng a 5/16 will be more than plenty but I'd go with 3/8 as you might swap in a stroked 440 in the future . Also a 1/4 return line to the tank so the fuel never deadheads along with a properly sized orifice restriction for psi management. A 3 prong filter with the right orifice will work with your current requirements

live every 24 hour block of time like it's your last day on earth
Re: is 3/8" fuel line too much ? [Re: RapidRobert] #1339852
11/23/12 11:26 AM 11/23/12 11:26 AM
Joined: Nov 2004
Posts: 7,647
Houston Texas
PAINT IT BLACK Offline
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nah 3/8 is what I'd minimally run on any old V8. Can't hurt anything.

I run a 1/2" hardline up to my filter then mechanical pump, then go out 3/8 to everything else (Keeping the volume more than adequate on the intake side of the pump is also a good idea - think I read that on a RobbMc article). The 3/8 turns into 1/2" again at the carb. Pics (want to brag... just got this all installed - note the modded Holley adjustable cable bracket/return (I love symmetry - that was a treat). This is on a 408 with Al heads.

7473175-IMG_0663.JPG (47 downloads)
Re: is 3/8" fuel line too much ? [Re: PAINT IT BLACK] #1339853
11/23/12 11:28 AM 11/23/12 11:28 AM
Joined: Nov 2004
Posts: 7,647
Houston Texas
PAINT IT BLACK Offline
Got a CHIP on my shoulder
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Got a CHIP on my shoulder

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Sorry to hijak, just excited with new toys.


7473178-IMG_0669.JPG (45 downloads)
Re: is 3/8" fuel line too much ? [Re: PAINT IT BLACK] #1339854
11/23/12 11:29 AM 11/23/12 11:29 AM
Joined: Nov 2004
Posts: 7,647
Houston Texas
PAINT IT BLACK Offline
Got a CHIP on my shoulder
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Houston Texas
Last one.

Really.... 3/8 lines. No sweat. But look for bottle necks in fittings/sending unit, etc. Some NPT fittings you may have to drill out to get a true diameter like I did on my 1/2" feed to the Carter pump. It takes a 1/4" NPT (fittings a 1/4"NPT M to -8 M , but that's huge enough to drill quite a bit out on the NPT side and get the inside diameter close to the feed line, which is -8 AN.

7473179-IMG_0671.JPG (39 downloads)
Re: is 3/8" fuel line too much ? [Re: intragration] #1339855
11/23/12 11:35 AM 11/23/12 11:35 AM
Joined: Nov 2004
Posts: 7,647
Houston Texas
PAINT IT BLACK Offline
Got a CHIP on my shoulder
PAINT IT BLACK  Offline
Got a CHIP on my shoulder

Joined: Nov 2004
Posts: 7,647
Houston Texas
Quote:

I have a mid '80s car that originally came with a carbureted V6 and I was surprised to see that it had 3/8" lines. Your 383 should like it. The only concern may be with the original sending unit, if it has smaller fittings. When I put 3/8" lines on my 'Cuda, I also put in a new sending unit. If yours was originally 5/16", you may want to check this out too.



Was a pain for me to find my 1/2" fitting sending unit... I kinda get the feeling no one really runs a mechanical pump with a 1/2" feed... Oh well, dare to be different. Then get out your wallet.
Re: is 3/8" fuel line too much ? [Re: PAINT IT BLACK] #1339856
11/23/12 11:39 AM 11/23/12 11:39 AM
Joined: Jan 2003
Posts: 2,502
Shelby, Ohio
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2abodymcodes Offline OP
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Shelby, Ohio
clean looking set-up. one other question, can i use brake line as my return line ? i have boxes of that already. what is the difference between brake line and fuel line ??
Re: is 3/8" fuel line too much ? [Re: ahy] #1339857
11/23/12 12:22 PM 11/23/12 12:22 PM
Joined: Jan 2003
Posts: 75,050
U.S.S.A.
JohnRR Offline
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Quote:

3/8" is great. OE would have likley been 5/16". The 3/8 line will have a bit less restriction and help reduce the possibility of fuel problems with todays gas which boils easier since its made for pressurized EFI systems.

For an even more robust setup, add a return line and use the "3 prong" filter which returns any vapor and some gas gack to the tank. 1/4" is fine for the return line.





That's a nice thought but its wishful thinking at best , BTDT

Adding the return line and an electric pump is the best avenue to try to deal with the fuel issue .
Re: is 3/8" fuel line too much ? [Re: 2abodymcodes] #1339858
11/23/12 07:00 PM 11/23/12 07:00 PM
Joined: Jan 2003
Posts: 10,735
North Dakota
6PakBee Offline
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Quote:

69 b-body with mostly stock 383. it will probably have around a 700 edelbrock carb.

Mostly stock 383? With this setup a 3/8" line is more than adequate.

"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
Re: is 3/8" fuel line too much ? [Re: 2abodymcodes] #1339859
11/24/12 12:12 AM 11/24/12 12:12 AM
Joined: Jan 2007
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ahy Offline
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Quote:

clean looking set-up. one other question, can i use brake line as my return line ? i have boxes of that already. what is the difference between brake line and fuel line ??



I would think brake line would be fine for the return if you have 1/4" diameter.

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