-8 feed/ -6 return ?
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Im not going to have this thing making that much power all the time probably keep the boost way down that much on the street is no fun at all so i think i will be ok with the -8/-6 lines they seem fairly sure i am.
as for your question I would go 10 / 8 just in case in the future you want more out of your set up. you want to make sure the fuel is there and you don't have to go back and redo the job. you can y the at the rail just to make sure both get equal amount and use the 8an
But future proofing can never do any harm.
-8/-6 will support a lot of flow though. I've had that with my 2x044's for around 10 years now and no issues.
I recently installed an Aeromotive FP regulator (pn 13129) after the fuel rails on my setup and am still using the stock lines. The return line is 5/16" (similar to -5). At idle, with a Walbro 450 pump, I can turn the FP all the way down to 40 psi which is as low as the regulator will go. This regulator solved my rich decel issues I was having with the stock regulator. So it seems to me that 5/16" return line is adequately sized while on E85, unknown about gas at this time. So, I believe a -6 return line would be a safe bet.







