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Old 04-24-2012, 04:30 AM
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AN fuel line?

On my 1968 caddy with a 472 I am wanting to replace the hard fuel line from the filter to the quadrejet carb with a flexible AN line. It would simplify some of the installation and routing issues. Plus it would look cooler. Now the hard line is 5/16th line with the standard fittings. I have been using 1/2 inch wrenches to turn the fuel line nuts but I am not sure if that is the right size of the threaded part for the AN to NPT adapter. Also I may have the AN size wrong, but I think it is -6AN. So my questions are: what is the right size of AN line and what size fittings to hook up my quadrajet?

And while typing this post I had an idea to make the hard line much easier to install so I may not need this info, but any advice or info is appreciated.

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Old 04-24-2012, 05:24 AM
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Summit have AN pump to carb kits if that helps.
One of the fist changes I made to mine.
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Old 04-24-2012, 01:50 PM
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AN line is equal to 1/16th of an inch for each -digit, ie, -2=2/16"(1/8), -6=6/16(3/8), -8=1/2"(8/16)

Sizes are measure by the inside diameter of the hose or tube. Nut and adapter sizes are measured by actual thread or hose size, the size of the wrench needed to work on the fittngs has nothing to do with the sizing or labeling of the parts.
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