> it was said the crash requirements drove the rubber
> tube.
>
That would require an all-knowing assumption as to the most common
destruction mode of the structure in the event of a crash. Then test
it, both metal and rubber lines, in crashes. :-) Our gov't actually
does that for free, where auto mfrs supply vehicles to crash, and
"Detroit" at times gets it wrong.
Common practice if in doubt is a short flexible hose at the tank,
thence aluminum. Seems not much space at the tank outlet to provide
for "crashability" by design of the bend in a pipe and attention to
attach points. 2024 aluminum is common with fuel lines.
Most people use 3003 Versatube for the fuel lines, sometimes 5052 which is
a bit stiffer. versatube is almost as soft as rubber (;-)
Not too difficult to go all the way to the firewall. IMHO 2024 is too stiff .
Graham
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