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Technical Fuel tank plumbing question

Discussion in 'Traditional Hot Rods' started by magnus13, Mar 16, 2019.

  1. magnus13
    Joined: Jun 1, 2013
    Posts: 141

    magnus13
    Member
    from California

    Question about how your connecting fuel lines to your fuel tank:
    I see a lot of guys running hardlines for their fuel from the tank to the engine, but are you connecting the Hardline directly to the tank? Or do you connect it to a small section of flexible fuel line that connects to the tank?

    I don't expect any tank movement, but I wanted to check before I plumb this whole thing in.

    Thanks


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  2. Blue One
    Joined: Feb 6, 2010
    Posts: 11,146

    Blue One
    ALLIANCE MEMBER
    from Alberta

    I used hard line coming off the top of my RPU tank and then I ran it down to just through the bed.
    Then using the proper fuel hose (Gates Barrier) and fittings I made a short flexible hose to connect it to the fuel line on the frame.

    There is another similar hose up front going to the fuel pump.
    There are no hose clamps in my system.

    176A6A7E-E778-45EE-8F14-7D3CA9F39E40.jpeg 96A02B85-3092-4105-89E3-4DC1A653809B.jpeg 9F076E81-4234-4104-8FAF-94BD63A36A21.jpeg 5855F51C-586F-4627-938C-9B67024A8A47.jpeg
     
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  3. Johnny Gee
    Joined: Dec 3, 2009
    Posts: 9,380

    Johnny Gee
    Member
    from Downey, Ca

    Hard line direct from tank is the norm.
     
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  4. BJR
    Joined: Mar 11, 2005
    Posts: 7,070

    BJR
    Member

    You only need flex line when you have movement of one part or the other. So under normal circumstances just flex line between engine and the line. Unless the tank is rubber mounted and can move.
     
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  5. 34fordjay
    Joined: Sep 10, 2009
    Posts: 86

    34fordjay
    Member
    from Mass USA

    You used some nice pretty fittings and everything looks good.
     
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  6. oldolds
    Joined: Oct 18, 2010
    Posts: 3,175

    oldolds
    Member

    I like some flexible line between the tank and the frame. I seems most newer vehicles are that way.
     
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  7. magnus13
    Joined: Jun 1, 2013
    Posts: 141

    magnus13
    Member
    from California

    That's a clean setup. Thanks

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  8. magnus13
    Joined: Jun 1, 2013
    Posts: 141

    magnus13
    Member
    from California

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  9. Blue One
    Joined: Feb 6, 2010
    Posts: 11,146

    Blue One
    ALLIANCE MEMBER
    from Alberta

    The idea was not so much for movement as there will probably be very little.
    Future disassembly however is a consideration and the hose and fittings make that much easier.
    It’s called planning.
     
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  10. Blues4U
    Joined: Oct 1, 2015
    Posts: 5,798

    Blues4U
    Member
    from So Cal

    I went with hard line from the tank to the frame up to the engine area, rubber fuel line from there to the engine.

    I don't see how have a soft line from the tank to the frame will make removal of either the tank or the line any easier.
     
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  11. 41fred207
    Joined: Feb 7, 2011
    Posts: 103

    41fred207
    Member

    Nice job! Your not concerned running your fuel line over the exhaust? Probably not a lot of heat back that far anyway..
     
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  12. Depends on how the tank mounts and dismounts,
    Can you remove the lines with tank in place?
    If no then you need some flex
     
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  13. Johnny Gee
    Joined: Dec 3, 2009
    Posts: 9,380

    Johnny Gee
    Member
    from Downey, Ca

    Short hard line from tank to main line via an inverted union is also another option for accessibility.
     
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  14. Tanks recommends using a flexible line between the fuel tank and the frame , i have always done it that way. not saying you will have problems if you don't

    as for running fuel lines over the exhaust...i have always planned it so no fitting is directly over the exhaust. if a fitting has a small leak it won't drip on the exhaust

    just my 2 cents
     
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  15. Johnny Gee
    Joined: Dec 3, 2009
    Posts: 9,380

    Johnny Gee
    Member
    from Downey, Ca

    That would be understandable since not everyone would make sure to not have stress at the point of connection.
     
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  16. Blue One
    Joined: Feb 6, 2010
    Posts: 11,146

    Blue One
    ALLIANCE MEMBER
    from Alberta

    My plan is to be able to remove the tank and then since the hard fuel line runs through the metal bottom of the bed through a tight fitting grommet , consider what would have to be done if the bed needed to be removed for some reason like repair etc.
    Trying to explain this stuff is getting somewhat frustrating :rolleyes:
     
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  17. Blue One
    Joined: Feb 6, 2010
    Posts: 11,146

    Blue One
    ALLIANCE MEMBER
    from Alberta

    The fuel line is far enough away from the exhaust, and the exhaust is ceramic coated which helps it run cooler than uncoated.

    As for leaks, there shouldn’t be any with the good inverted flare fittings.
     
  18. mgtstumpy
    Joined: Jul 20, 2006
    Posts: 8,874

    mgtstumpy
    Member

    Hard line all the way with flex line on both ends. Easier servicing if & when required


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