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  1. #1
    Yellow93's Avatar
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    How to keep AN fittings from loosening?

    I read in other posts where people talked about AN fittings working their way loose due to engine vibrations. I had just this thing happen to me this weekend with a couple fittings on my fuel system. How can you keep them from coming loose? I guess I could get rid of them completely and just use hose but would rather not if I didn't have to. The main one I had problems with was the one connected to the end of my aftermarket fuel rail where my fuel pressure gauge is attached.


  2. #2
    was it a swivel or a 90 degree ? take a pic of how everything is set up if possible.

  3. #3
    1200 stx-r's Avatar
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    in some situations on the aircraft engines i build we drill the back edge from 1 flat through the corner to the next flat and then use safety wire to an adjacent part or fixture. remember to not wire it backwards.....

  4. #4
    Gus13letter's Avatar
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    Hmm, never heard of this. If you snug them down enough they basically lock themselves together. Maybe they weren't tightened enough?

  5. #5
    64physhy's Avatar
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    Is it where 2 AN fittings screw together, or is it an AN fitting connected to a flared line? AN fittings come in at least 2 different angles of flare. If you mis-matched them, that could be the problem. They are used on dragsters and racecars with a lot more vibrations than these skis, so they shouldn't come loose if done right.

  6. #6
    1200 stx-r's Avatar
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    I use them on the engines on an A-10 warthog...don't even think for a second that they dont loosen up even with proper torque.......

  7. #7
    Yellow93's Avatar
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    The problem is where 2 AN fittings are screwed together.

  8. #8
    best advice i can give you is tie strap the hoses every 12" or so against anything near by.the way -an fittings lock if the hose spins it breaks the fittings free so if you allow to much hose movement between the engine and were you have the regulator mounted the vibration will unscrew the fittings.

  9. #9
    Yellow93's Avatar
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    Thanks! I think I will just switch everything over to hoses and be done with it.

  10. #10
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    Quote Originally Posted by Yellow93 View Post
    The problem is where 2 AN fittings are screwed together.
    Via a coupler? U can wire one nut to the other or wire behind the secured nut but on the line to same spot on other side. As long as wire is tight hoses cant back off .

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