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LS1 fuel line size

Old 11-13-2018, 11:03 PM
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Default LS1 fuel line size

Hi, for a NA <400HP LS1, how large does the fuel line need to be

5/16 -6AN
3/4 -8AN

Using a 99-02 Camaro Fuel pump (combining the supply and return of the pump into a Y and running directly to the fuel rails

tried searching but cant find answer.
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Old 11-13-2018, 11:10 PM
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No regulator? For what you have, stock size lines will be plenty.
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Old 11-13-2018, 11:17 PM
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LS1 fuel rail diameter is 9.5mm so 3/8" - But is 5/16 -6AN lines big enough ?

Last edited by 90Vette; 11-14-2018 at 10:53 PM.
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Old 11-13-2018, 11:23 PM
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Not sure. I think it's a metric size.
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Old 11-13-2018, 11:32 PM
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Originally Posted by G Atsma View Post
No regulator? For what you have, stock size lines will be plenty.
Regulator is in the fuel pump

What is the stock line size for LS1 ?

Going in 1980 C3 corvette. It had 2 rails, one 3/8 and one 5/16. But im running lines on other side so i need to run a new line. Will use Summit Racing® Stainless Steel Hose SUM-230620. Not running E85 or ethanol.

I have a bunch of 5/16 6AN fittings so i hope i can use them and the -6AN hose i have
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Old 11-20-2018, 10:36 PM
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AN hose numbers are the size. The 6 stands for 6/16" or 3/8". 8 stands for 8/16" or 1/2". -6 or 3/8" will support 850HP with good swept fittings unless there is to much rise from tank to motor.
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