AN8 hose with a PTFE liner and stainless steel braid, sold by the foot. AN8 is the size to step up to when a fuel system outgrows AN6, and it also serves oil cooler and transmission cooler runs well. The PTFE liner seals in fuel vapour completely, resists ethanol and methanol blends and copes with sustained hot oil without softening, so lines stay serviceable for many years rather than needing periodic replacement. The stainless braid contains the hose under pressure and shields it from abrasion. Bear in mind that PTFE hose is stiffer than rubber, so route it with sweeping bends and assemble it with AN8 hose ends made for PTFE.