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"The best fuel line material depends on your needs. However, the best material for fuel lines is <b>polytetrafluoroethylene or PTFE</b>. PTFE fuel line is made of plastic material specifically known as Teflon. This fuel line material is impervious is resistant to the degenerative fuel effects which could form vapor barriers."
<https://podbharti.com/articles/how-much-does-fuel-line-cost>