AN fuel hose size. please help! - Team Camaro Tech
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post #1 of 6 (permalink) Old May 8th, 02, 04:43 PM Thread Starter
Join Date: Apr 2001
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what size hose is good for a fuel line? i now have a solid 3/8" fuel line and want to put some steel braided hose in. i dont understand the "AN" sizes. is -6 good? what size is the same or close to 3/8"

thanks john

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post #2 of 6 (permalink) Old May 8th, 02, 04:53 PM
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I used #8 on my car. It is about 7/16. #6 is a little smaller than 3/8.

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post #3 of 6 (permalink) Old May 8th, 02, 07:31 PM
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Take the army/navy 'AN' size and divide by 16.Example AN size 8 would equal a 1/2inch line.AN 6 would equal .375 which is 3/8ths.Easy!
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post #4 of 6 (permalink) Old May 8th, 02, 08:01 PM
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I think it originally stood for 1/16ths of an inch as above, but I agree with Biggearhead, #6 is smaller than 3/8" and #8 is a little larger. I always use at least #8 for my fuel lines.

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post #5 of 6 (permalink) Old May 8th, 02, 08:29 PM
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The AN (for Army Navy) standards as noted above can run small.

Hard line tubing is spec'ed as an O.D. size plus a wall thickness. For the hardline components to interchange they must fit a common size, and that's the O.D. Different wall thicknesses are used for different pressure requirements. So, a 3/8" (-6) hard line with a 0.020" wall will have an I.D. of 0.330", or just larger than 5/16".

Flexible lines are spec'ed by their inside diameter and run close their respective sizes. The fittings are specific to the hose manufacturer (or should be). In most cases the fittings have a much smaller bore than the hose they are attached to. The Aeroquip hose on my car that's used to tie the primary and secondary bowls together is a -6 line but the bores in the end fittings is 1/4"!
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post #6 of 6 (permalink) Old May 9th, 02, 07:25 AM Thread Starter
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thanks all. i think ill go with the #8 lines.


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