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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » What diameter is the fuel line, pump to carb supposed to be?

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    7/13/2016 7:28 AM  #1

    LondonSteve
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    From: London, Ontario, Canada
    Registered: 4/01/2013
    Posts: 136

    What diameter is the fuel line, pump to carb supposed to be?

    I have a 67 Mustang with a 302 in it. All the new fuel lines from tank to pump are 3/8"

    I have a pre-bent original steel line from pump to carb, but it is only 5/16"

    Are all the pump to carb lines 5/16" or are they supposed to be 3/8" as well? Is the short run of slightly smaller 5/16" that I have going to be a problem for fuel supply to the 302 if I use it? or should I buy a new pump to carb line in 3/8" diameter. The NPD listings make no mention of what the diameter of the lines are. 

    Thanks

     

    7/13/2016 7:43 AM  #2

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,391

    Re: What diameter is the fuel line, pump to carb supposed to be?

    5/16" tube is stock size

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    7/13/2016 9:40 AM  #3

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,630

    Re: What diameter is the fuel line, pump to carb supposed to be?

    It all depends on what you're trying to do power wise.  For a stock to stockish engine the 5/16" line is going to be fine.  If you're looking to feed real power (350HP+) I would go to 3/8". 

     

    7/13/2016 10:59 AM  #4

    LondonSteve
    FYI Addict

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    From: London, Ontario, Canada
    Registered: 4/01/2013
    Posts: 136

    Re: What diameter is the fuel line, pump to carb supposed to be?

    It's a stock 302, no mods. After posting, I realized that NPD lists the entire line right from the tank for 289 engines at 5/16". Looks like they only went to 3/8" in 68. I happened to have 68 lines on hand in the 3/8" size from a previous project.

    I think I am going to stick with my existing stock pre-bent 5/16" line for the pump to carb run. It already fits perfectly. 

    Thanks for the reassurances.

       •Thread Starter
     

    7/13/2016 5:54 PM  #5

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,630

    Re: What diameter is the fuel line, pump to carb supposed to be?

    Yeah, it will be fine for that.  Its nice to have that 3/8" tank to pump line though in case you ever want to pump up the power.  I'm going to have to change mine out when I drop in my 347, as I have a '67. 

     

     

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  •  »  What diameter is the fuel line, pump to carb supposed to be?

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