I've never seen molded fuel fill hose for marine use but Sierra Marine has a hose that they call "extra flexible"
https://www.iboats.com/shop/shields-fire-acol-c-fuel-fill-hose-a2-1-1-2-x10-116-351-1123.html
"[FONT=helvetica,Arial, Helvetica, sans-serif]Shields Fire Acol "C" Fuel Fill Hose[/FONT]
[FONT=helvetica,Arial, Helvetica, sans-serif]r e s i s t s g a s o l i n e / a l c o h o l bl e n d s a n d[/FONT]
[FONT=helvetica,Arial, Helvetica, sans-serif]h a s a c o r r u g a t e d c o v e r fo r ex t r a[/FONT]
[FONT=helvetica,Arial, Helvetica, sans-serif]flexibility. This hose is compounded for low[/FONT]
[FONT=helvetica,Arial, Helvetica, sans-serif]permeation and is reinforced with a wire he-[/FONT]
[FONT=helvetica,Arial, Helvetica, sans-serif]lix imbedded between plies of HD synthetic[/FONT]
[FONT=helvetica,Arial, Helvetica, sans-serif]cord. It is also abrasion resistant. This hose[/FONT]
[FONT=helvetica,Arial, Helvetica, sans-serif]is primarily used for extra flexible fuel fill ([/FONT]
[FONT=helvetica,Arial, Helvetica, sans-serif]gas or diesel ) and is for pleasure boats only.[/FONT]
[FONT=helvetica,Arial, Helvetica, sans-serif]The temperature range is -5ºF to 180ºF. It[/FONT]
[FONT=helvetica,Arial, Helvetica, sans-serif]meets SAE J1527 type A2 and NMMA Type[/FONT]
[FONT=helvetica,Arial, Helvetica, sans-serif]Accepted standards"
It comes as a 10' length. Maybe it would work for you.[/FONT]