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Fuel Line Size #3175919
09/17/23 09:38 PM
09/17/23 09:38 PM
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Missouri
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3_RTs Offline OP
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I have a 69 Coronet R/T . Is the stock fuel line size 3/8"? And also is the stock fuel pump size 5/16"? The car didn't have fuel lines when I bought it so I had no personal reference. Thanks.

Re: Fuel Line Size [Re: 3_RTs] #3175922
09/17/23 09:53 PM
09/17/23 09:53 PM
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Omaha Ne
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TJP Offline
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3/8 would be preferred with a BB assuming it's basically stock or mild mod's twocents

Re: Fuel Line Size [Re: TJP] #3175966
09/18/23 08:26 AM
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dragon slayer Offline
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I believe that is correct. 3/8" from tank to pump. 5/16" from pump to carb.

Re: Fuel Line Size [Re: dragon slayer] #3175969
09/18/23 08:37 AM
09/18/23 08:37 AM
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The 440 and Hemi got the 3/8 from tank to the pump 5/16 from the pump to carb. The 383 down used 5/16 the entire way

Last edited by 69hemibeep; 09/18/23 05:19 PM.

1969 Hemi Roadrunner 2nd owner
Re: Fuel Line Size [Re: 69hemibeep] #3175972
09/18/23 09:06 AM
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Im of the idea all 440 and hemi cars were SUPPOSED to get 3/8" line.

But I remember many 440 cars from 25-30 years Ive had in the day that were 5/16" . Both 4 bbl and sixpack cars


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Re: Fuel Line Size [Re: gtx6970] #3175988
09/18/23 10:04 AM
09/18/23 10:04 AM
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jlatessa Offline
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This^^, Yep, my A12 had a 5/16" and so did any 440 I worked on, "in the day"

Joe

Re: Fuel Line Size [Re: jlatessa] #3176021
09/18/23 11:53 AM
09/18/23 11:53 AM
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Gtx6970 and jlatessa, I remember from the ones I've had in the past (440 cars) that they had 5/16" lines from the fuel tank. I'm in the process of connecting my new lines up on my current 440, and I don't ever remember going from a 3,8" line to the 5/16" inlet on the fuel pump. I don't believe any rubber hose is 3/8" on one end and 5/16" on the other. I looked up the fuel pump in my SM and it lists MS4845 for the number of the fuel pump. That particular pump has a 5/16" inlet.

I can make my situation work, but I have never had to go from larger line to smaller line before. Maybe I should have gotten the 5/16" line in the first place.

Re: Fuel Line Size [Re: 3_RTs] #3176053
09/18/23 01:48 PM
09/18/23 01:48 PM
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Morgan Hill, CA
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When I replaced the fuel line in my '68 Charger (440) 20 years ago, the old line was definitely 3/8". I remember because tech support at wherever I was ordering the new line from insisted the correct size was 5/16", and that the line in my car must have been changed. Sure looked like factory to me. I installed a 3/8" line to match the old one.

Re: Fuel Line Size [Re: ackpht] #3176078
09/18/23 03:51 PM
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it should also have a 1/4 return line

Last edited by CSK; 09/18/23 03:52 PM.

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

Re: Fuel Line Size [Re: 3_RTs] #3176685
09/20/23 02:09 PM
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My first 1969 gtx vert

Had a 5/16 main line. 1/4 return.
But had a 3/8 sender. Best I could tell was all factory

Had a 5/16 rubber hose forced over the 3/8 sender

Don't remember fuel pump fitting size

My 2nd gtx vert was all 3/8 front to back.


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Re: Fuel Line Size [Re: gtx6970] #3176767
09/20/23 07:05 PM
09/20/23 07:05 PM
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fredericksburg,va
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cudaman1969 Offline
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5/16” on everything but the Hemi from all I’ve seen in 60 years

Re: Fuel Line Size [Re: cudaman1969] #3177017
09/21/23 07:00 PM
09/21/23 07:00 PM
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Huh: I also thought I'd seen somewhere in factory literature that 440s got 3/8".
Haven't had a 440 in many years, so I can't say what mine had; but I had a 512" RB that ran fine with a 3/8" system and only a good mech pump.

Re: Fuel Line Size [Re: topside] #3177129
09/22/23 07:34 AM
09/22/23 07:34 AM
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Apollo, PA.
B1MAXX Offline
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My 70 rt charger has 3/8 oem.

Re: Fuel Line Size [Re: B1MAXX] #3177140
09/22/23 08:39 AM
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It is funny as the parts book seems useless as it just mentions generic roll of 5/16" fuel line even under hemi. Didn't see anything in the tech bulletins. In the 69 dealer book under engine selection the hemi is listed as having "special 3/8" fuel line. I thought at some point in 68/69 time frame 440/hemi got the 3/8" fuel line to the pump. But who knows. Begs the question what did the A-12 get, since they started as 383s.

Re: Fuel Line Size [Re: dragon slayer] #3177159
09/22/23 10:20 AM
09/22/23 10:20 AM
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Originally Posted by dragon slayer
It is funny as the parts book seems useless as it just mentions generic roll of 5/16" fuel line even under hemi. Didn't see anything in the tech bulletins. In the 69 dealer book under engine selection the hemi is listed as having "special 3/8" fuel line. I thought at some point in 68/69 time frame 440/hemi got the 3/8" fuel line to the pump. But who knows. Begs the question what did the A-12 get, since they started as 383s.


I bought a 69 A12 that was that was in the restoration process, they hadn't gotten to the point of doing the fuel line, what was painted over on the underside of the car was 5/16 with no return line. The first run , 3/29 build date , had 5/16 lines, I don't know where the discussion has gone as I haven't been active in those forums for years .


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Re: Fuel Line Size [Re: JohnRR] #3177170
09/22/23 11:02 AM
09/22/23 11:02 AM
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Well, I purchased an A12 new in the spring of 1969 and in upgrading to a electric fuel pump from the back frame rail,
I can unequivocally tell you that I replaced the 5/16" line going to the mechanical pump.

I'm 81 years old and have pictures of my car on the carrier next to my buddies (a salesman at the dealership) M code Barracuda.
Those were the days!!!

Joe

Re: Fuel Line Size [Re: jlatessa] #3177199
09/22/23 12:45 PM
09/22/23 12:45 PM
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Apollo, PA.
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Just went up and calipered it...3/8 bone stock. tank to pump.

Re: Fuel Line Size [Re: jlatessa] #3177205
09/22/23 01:15 PM
09/22/23 01:15 PM
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Colleyville
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Originally Posted by jlatessa
Well, I purchased an A12 new in the spring of 1969 and in upgrading to a electric fuel pump from the back frame rail,
I can unequivocally tell you that I replaced the 5/16" line going to the mechanical pump.

I'm 81 years old and have pictures of my car on the carrier next to my buddies (a salesman at the dealership) M code Barracuda.
Those were the days!!!

Joe


I agree, a buddies Dad had a '70 Hemi 'Cuda, 4 speed, all stock, was selling it in 1975, I couldn't come up with the $2,000 for it, it wound up in Alaska. I've never seen factory 3/8" fuel lines on a mopar. IIRC, Dave Dudek extrude honed his factory 5/16" fuel lines to get a bit more flow?


'68 Fury Convertible
'69 300 Convertible
'15 Durango 5.7 Hemi
'16 300 S Hemi
Re: Fuel Line Size [Re: 3hundred] #3177218
09/22/23 02:02 PM
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Ohio
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B1MAXX...calipered the I.D.?

Joe

Re: Fuel Line Size [Re: jlatessa] #3177289
09/22/23 06:47 PM
09/22/23 06:47 PM
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fredericksburg,va
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My 66 Hemi Belvedere II has 3/8” line (30,000 original miles) 69 Cuda M code 5/16”

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