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Older RV-12 Fuel Tank Question

JLink125

I'm New Here
I recently purchased an RV-12 and would like to see if anyone has some info or drawings regarding the fuel tank lines in my aircraft. The plane was finished in 2010 so it has the older tank with the sight glass on the side. I have looked through all the drawings and can't figure out why I have three lines coming up into the filler neck. I know the fuel return line should be there but the other two I have no idea. This appears to be a non-standard tank build but I figured I'd ask. My friend Seagull used his camera to get down into the neck and you can see the three lines in mine verses the single return line in his.
 

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    Fuel tank filler neck image 2.jpg
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