PTFE For Fuel Line - Conductive vs Non-conductive

A static charge can build in the unlined hose away from the metal end fittings. Sufficient charge can arc through the hose wall to the braid that is the same potential as the fittings. A conductive liner prevents the static build up at a different rate than the fittings and braid, so there is little to no difference in voltage to cause arc through the hose wall. A minimal length of unlined ptfe hose with a carb and reasonable size pump with little to no bypass/return flow should minimize the potential charge. Black hose and nylon line have carbon which provides some conductivity. I prefer steel brake line with as little barricade hose as necessary to make connections and allow for engine movement and some slack for stress relief.