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GT40 Tech - Fueling, Electrics, & Engine Cooling Petrol, Electrons, & Water

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Old 2nd March 2018, 12:53 AM   #1
Cliffbeer2
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Minimum fuel line size for 347 with EFI

Just a quick question here - interested in folk's opinion on minimum fuel line size for a mild-ish 347 running 8 stack/multi-port EFI. My current system is plumbed with AN-6 and it just looks a little small to me. Fuel pressure is in the 60psi range with twin pumps and a fuel pressure accumulator (not a swirl pot).

Don't want to starve my engine at WOT. AN-6 big enough??? Thanks in advance.
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Old 2nd March 2018, 01:05 AM   #2
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Re: Minimum fuel line size for 347 with EFI

I’d say you are well within the limits of a 6AN line size. The C6 Corvette Z06 Cars with 505 hp use this size at about 58 psi.
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Old 2nd March 2018, 11:17 AM   #3
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Re: Minimum fuel line size for 347 with EFI

I agree.. -6 should be just fine.
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Old 2nd March 2018, 12:20 PM   #4
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Re: Minimum fuel line size for 347 with EFI

-6 is all you need. Should be able to support 600hp at 4 bar, maybe even 3 bar.
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Old 2nd March 2018, 08:51 PM   #5
Cliffbeer2
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Re: Minimum fuel line size for 347 with EFI

Perfect. Thanks gents, appreciate the input. I'll stick with the AN-6.
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Old 2nd March 2018, 10:34 PM   #6
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Re: Minimum fuel line size for 347 with EFI

Cliff,
FWIW, I buy most all my EFI parts and plumbing from GoodVibesRacing out of Whittier, CA. They're friendly folks and ship fast!
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Old 5th March 2018, 08:54 PM   #7
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Re: Minimum fuel line size for 347 with EFI

I was going to to say 3/8". I think that's -6AN. I have 1/2" fuel line on my Buick. But that engine is 462 cid.
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