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  •  » flaring 3/8" stainless fuel line

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    3/10/2019 11:53 AM  #1

    1fststang
    I FYI 24-7

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    Registered: 6/02/2013
    Posts: 419

    flaring 3/8" stainless fuel line

    I had posted earlier in the " what have you done to your Mustang today" post about trying to flare the 3/8" stainless.

    I had problems with the line splitting.  I had heard tubing cutters harden the line and can cause problems. I also suspected maybe the line was slipping a little during the flaring process.

    So I used a 32 tpi hacksaw blade as many recommend and was surprised how quickly it cuts the line.  I think used a file to try and make sure the cut was square.  I filed the outer edge just a little bevel or at least just enough to soften the edge and debur. I deburred the inside with a round file then the same round file with some fine emery cloth.

    I then loaded the line in my MasterCool flaring tool.  I marked where the line bottomed out against the flair die so I could determined after if it slipped or not.  Then I used the two die flaring process and with very little pumping effort on the tool but processed flared quite easily.

    Its a little dirty but looks like a pretty good result that will hopefully not leak.



     

     

    3/10/2019 3:12 PM  #2

    Rudi
    Senior 24-7 FYI Addict

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    From: Stuck in the 50's Welland Ca
    Registered: 4/01/2013
    Posts: 3,982

    Re: flaring 3/8" stainless fuel line

    I used the very same preparation method on the 3/8” SS fuel and 3/16” brake lines but use a 50 year old  Eaton flaring tool.  I clamp the tubing a bit proud in the tubing clamp and file the tube flat to its top surface insuring that it is 100% square.
    Of course when using a fine tooth hack saw, the lines have to be washed a blown clean.
    I have always maintained that the problems people have with stainless lines is poor tubing prep and the quality of the tubing, I will only use tubing from Inline Tube and have never had any issues

    Good work ain't cheap, Cheap work ain't good!   Simple Man
     

    3/10/2019 3:30 PM  #3

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,299

    Re: flaring 3/8" stainless fuel line

    Rudi wrote:

    I used the very same preparation method on the 3/8” SS fuel and 3/16” brake lines but use a 50 year old Eaton flaring tool. I clamp the tubing a bit proud in the tubing clamp and file the tube flat to its top surface insuring that it is 100% square.
    Of course when using a fine tooth hack saw, the lines have to be washed a blown clean.
    I have always maintained that the problems people have with stainless lines is poor tubing prep and the quality of the tubing, I will only use tubing from Inline Tube and have never had any issues

    Rudi, I use a similar method to square up the tubing cut.  I make it stick outside the flat side of the flaring clamp then file it flat using the flat side as the stopping point for the file.  Doing it on the rear, flat side of the clamp bar keeps it from flaring out as it is deburred.  I also leave it clamped there while cleaning up the ID.
    As with any size tubing, the secret to getting a good seal is to NOT overtighten the second half of the flare process.
     

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

    3/10/2019 10:03 PM  #4

    351MooseStang
    FYI FORD Member

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    From: Brookings, Oregon
    Registered: 4/03/2013
    Posts: 91

    Re: flaring 3/8" stainless fuel line

    I feed a bit of compressed air through the other end of the line when cutting it with a hacksaw. Keep the air going until the end is finished and ready for flaring.

    I still clean the lines before using but I want to make it as little work for myself as possible,

     

     

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