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To deal with movement between components flex lines are necessary in any fuel system, this is generally done with standard “rubber” or braided hose. For a number of years the additives in fuel have created problems in the fuel hose, but they were nothing compared to the issues with ethanol. In most cases ethanol lowers fuel mileage, it corrodes metal parts, causes rubber and plastic parts to deteriorate, absorbs water and shortens storage life. The best way to protect your street rod’s fuel system is to use rigid stainless steel fuel line, stainless clamps and fittings, keep the flex line to a minimum, and use hose that is specifically for ethanol.