When you do the soft fuel lines for the 617 swap, use SAE30R9 high pressure fuel hose and you'll be able to run biodiesel in the truck. This hose has a fluoro-elastomer lining that is alcohol resistant and will keep the biodiesel from rotting stock fuel lines. It's available at most all chain auto parts stores if you ask for "high pressure fuel injection hose" Just check it and it will have "SAE30R9" imprinted on it. If it has "SAE30R7" it's not the right nose.

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