I don,t think it will be an issue because your earlier potential use of 3/8" fuel lines would have probably worked,
it would just have been marginal, at the power levels you should expect, or might eventually reach with a few minor upgrades, now that the rest of the systems been upgraded to AN#8 or 1/2" . that single potential restrictions not
as likely to cause issues, would upgrading the valve size to a true AN#8 be a good idea?, yes it would, but its also not likely to matter much at anything under 500-550 hp as thats usually the max you can reliably feed thru a 3/8" fuel line feeding a carburetor before the restriction to flow becomes a significant issue. keep in mind the same RATIO of restriction would generally happen if you had been using all 3/8" fuel lines and fittings so if you used 3/8" or AN#6 theres a strong chance that an internal fitting would have restricted flow to less than what a strait section of AN#6 would have provided, so by upgrading to AN#8 the internal fitting is far less restrictive, in your current fuel supply.
the use of AN#8 or 1/2" lines just removes any potential for the fuel system to prove to be a restriction to power to at least 700 hp, so any time Ive build a combo that MIGHT have the fuel lines become a restriction its a good idea to make sure its not going to be an issue.
remember I said that early in this thread.RELATED INFOhttp://www.smartfireinjectors.com/fuelflowchart.htmlviewtopic.php?f=55&t=211&p=247#p247viewtopic.php?f=55&t=1939viewtopic.php?f=55&t=635viewtopic.php?f=55&t=109viewtopic.php?f=55&t=1200VERY INTERESTING ADDITION TO THE POTENTIAL FUEL SYSTEM DESIGN
http://www.motoiq.com/MagazineArticles/ ... rvoir.aspxgrumpyvette wrote:while an engine like the one built here for the T-bucket can get by with AN#6 LINES (3/8") as your not likely to exceed the potential flow restriction limitations of that size fuel line, and you only need about 100 gph pump and about 6 psi, IVE ALWAYS PREFERRED THE LARGER AN#8 fuel line size and an ELECTRIC fuel pump that puts out a minimum of 140 gph mounted back as close too the fuel cell or fuel tank,and as low as possible and used with a return style regulator.
my current EFI 383 has a walpro 255 that provides 40 psi but uses 3/8" lines , and it will supply the required fuel to maintain about 500 hp.
keep in mind Im using an extensively ported stealth ram base with a custom plenum and throttle body and and 36 lb injectors on my 383 SBCon my 496 BIG BLOCK I found the larger size fuel lines and larger pump with a fuel cell installed mandatory, as the smaller lines allowed the engine power to drop noticeably by the time I had reached the 100 ft from launch point, swapping to the larger fuel pump helped noticeably
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