the real an thread.
 

hey i figured it would be a great help if we could try to get the size fittings we need to rerun all of our lines in ss line. might be a dumb idea but i know alot of people want to know what size fittings they need. i need to know what size fittings i need for hayame fuel rail input and fuel filter. ill guess and say prolly 3/8" npt on the rail and 1/4" npt on the filter. any1 know if this is right?

Re: the real an thread. (KraZEtEggIE)
 

If your fuel needs arent actually in need of being bigger and you just want it to look cool then use 1/4 npt by -6an for the feed side. the ID of -6 is 5/16 hose.