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I used an m12 to 6an check valve I snapped up off ebay for under $25 shipped just two days ago. If you don't want a check valve then an m12 to 6an adapter is under $10, again on ebay. I mated it all with a 90 degree 6an swivel head which met up with my 6an main fuel line through the tunnel. Used 2 3/8" aluminum tubes for feed and return, works awesome and is a permanent solution not to mention very clean.
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No physical quantity completely explains its own existence
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