Those fuel lines are going to age, crack and deteriorate on their own. It won't have anything to do with B20. Well, hardly anything.

Those of us running B100 just accept the fact that it may mean we have to replace 20 bucks worth of fuel hose at year 4 instead of year 10.

JP

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1985 300SD
2001 Toyota Tundra - soon to be replaced with diesel truck
2006 Honda CRV