DIY: Stock 5/16 hardlines to 3/8 or -6
 

because i searched and searched and searched and these threads are all over the place... my plan here is to provide pics and an overview of how i did this.


TOOLS:
Tubing cutter
Summit 37* flaring tool- pn# 900311



what i am doing is flaring my 5/16 stock lines to the 37* an flair and using tube nuts and sleeves in the -6 / 3/8s size. now i have cut a small piece of 3/8 tube and drilled it to slip over my stock hard line. so while the fitting mates with my 5/16 37* flair the 3/8 slipover tube acts to center the nut and sleeve.



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I did something like this but I failed at it. I didn't the 3/8 over the 5/16 fuel line, I did the 37 flare on the stock fuel line with a tube sleve like you have above, looked pretty but It leaked like hell lol.

I ordered -6 JIT (steel AN) fittings from Garfinkle, dropped the fuel lines, took them to a shop, and had them brazed on for 15$.