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Fuel Line Connections at Wing

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  • Fuel Line Connections at Wing

    Looking for some input on the pros/cons of using AN fitting connections for fuel lines at the wing root to fuselage versus flexible rubber fuel hose to make those connections. Having had a C182, I know that Cessna uses the flexible hose to make the connections. I've also experienced the flexible line deteriorating and cracking/leaking in my 182 but only after many years. Thanks.
    Larry Driver
    Bearhawk 4-Place Quickbuild N22LD
    Mogollon Airpark, Overgaard AZ

  • #2
    I think you understand the issues Larry. If you use a AeroQuip or high quality aircraft rubber line to connect the wing to the fuselage aluminum lines - eventually it will deteriorate. But last many years. My worst luck was with auto racing "high quality" rubber line. It lasted maybe 3-4 years. Much better luck with aircraft line. Mark

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    • #3
      I used solid aluminum lines all the way from the tank to the firewall, and so fat no problems.

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      • #4
        I put male AN adapters in the fuel tank outlets and made aluminum tubes to connect the tank to the tubes in the fuselage. Very easy to do. I swear it's easier than attaching hose to the nipple fittings.
        I got to be friends with the IA who did the annual inspections of my previous (certified) plane. Nick wanted to replace hoses at 5 years in service. "I know they're good for 5 yrs. Probably 7, but maybe not 10. At what point, past 5 yrs, are you still comfortable?" Nick asked. Excess caution? Yep! When Nick signed the inspection, you could bet the bank that the plane was safe for flight!
        I just didn't feel like changing those wing root hoses in 5 years. Ya never know when Nick might drop in and look around...

        Bill

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        • #5
          Thanks, everyone, for the input. Actually, Jared, it was your 360 video that you posted that got me thinking about this. (Yes, I "snooped around" in your plane.<g>)

          Bill, your IA was smart. I came out to go fly in my 182 one day and smelled fuel. Then all of a sudden saw blue stains running down the door posts. I'm not talking a small leak. It was more like a complete failure. Ended up draining tanks quickly. Glad I wasn't in air. I didn't know to check these and the IA doing my annuals obviously didn't check them. I don't have an issue with high-quality hose, as Mark suggests, but you do need plan on them being part of a maintenance cycle.
          Larry Driver
          Bearhawk 4-Place Quickbuild N22LD
          Mogollon Airpark, Overgaard AZ

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          • #6
            And this is probably a "duh" for most folks, but... Make sure when you replace the rubber part of the lines, you're replacing it with "fresh" tubing, not stuff that's been sitting around the shop for 5 years... (I know - I know - but SOMEBODY will do it one of these days...)
            Jim Parker
            Farmersville, TX (NE of Dallas)
            Patrol Quick-Build Serial # P312

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            • Bdflies
              Bdflies commented
              Editing a comment
              I'd probably be the one to do that.....

              Bill

          • #7

            I don't understand the issue, so my default setting is build IAW the plans. But now I am curious. What is the intent of the specified rubber hose? Why did Cessna specify Rubber hose?

            Brooks Cone
            Southeast Michigan
            Patrol #303, Kit build

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            • #8
              Possibly to give you some wiggle room to make that last connection - much (?) easier than getting two rigid lines to fit up just right.

              On that note, how might you get those two lines to meet exactly if you build the fuselage and wing lines separately? Mock up a wing root?

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              • jaredyates
                jaredyates commented
                Editing a comment
                Just plan to wait until the wings are on. Run the line up into space, or plan on a union fitting. Once the wings were on, it was really a non-event to get the bend right.

            • #9
              I made up short stubs of Versatube with AN fittings at the tank side that extend through the wing root rib. They were made long and will have to be trimmed and bent to mate up with the fuselage tubes. Still not sure which is going to be easier... rubber connecting hoses or AN fittings with a nipple coupler. It's a tight space.
              Larry Driver
              Bearhawk 4-Place Quickbuild N22LD
              Mogollon Airpark, Overgaard AZ

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              • #10
                I left that plumbing until the "final assembly" stage. For easier access. make the fuel hookups before installing the windshield

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                • #11
                  Would steel braided line last any longer?

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                  • #12
                    Originally posted by davzLSA View Post
                    Would steel braided line last any longer?
                    I would add to the question, would Teflon tubing last longer than neoprene or what every the "rubber" material is?

                    I did rear in the Aeroquip catalogue that there can be an issue with "oxidized fuel that is found in EFI system return lines.

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