The problems with Biodiesel are pretty much the same as with ethanol blend gas. The ethanol attacks some types of rubber and plastic, melting fuel lines from the inside and destroying gaskets. The second problem is what it does inside the tank. Ethanol is s strong solvent and the years of accumulated "gunk" in the fuel tank is loosened and dissolved and clogs filter and injectors. The third problem is that ethanol, like all alcohol is hydroscopic and attracts water, which greatly advances condensation in the tank and causes water in the fuel. We have had significant problems with biodiesel in our offshore boats. My last sportfish boat held 585 gallons of fuel. We never had any problems with filter clogs or water in the fuel until biodiesel came on the scene. I would avoid it like the plague. The engine manufacturers have changed the type of fule lines and gaskets on newer engine to deal with the first problem, but I still use only non-ethanol gas in all my outboards and small engines, after having several carb rebuilds as a result of using E10. Even if non-ethanol gas costs 30-40 cents more per gallon than E10, it's worth cost to avoid damage to the system.
