Cheap black hose did not work for me. It did not cope with Shell V-Power fuel. Hose became very soft and got kinks blocking the fuel to carbs within a week or 2. No China made hose for fuel, its a safety part.
I searched for fuel hoses made in UK, Germany and USA. Found Gates Barricade for fuel injection and made for all kind of fuels. No problem with Shell V-Power. 6mm from petcock (old style with dual pipes), adapters for 8mm hose that fit my carbs.
I guess that all kind of fuels will make the cheap metal braided China #$%* soft and dangerous.