Q: Understand that certain kinds of rubber are "corroded" by Ethyl/Methyl Ester fuel (bio-diesel), and others aren't. Anyone know what kind of rubber comes into contant with the fuel in these cars?
A: It's usually to do with the rubber seals & joints used, NOT the entire fuel lines. It's not due to vegetable oil, as is commonly misconstued, but as you rightly say, due to corrosive chemicals used in the production of biodiesel (usually caustic soda or similar). The usual thing to do is to either replace the seals prior to using bio, or more sensibly run it on bio to see if & when the seals fail - biodiesel will also drag all of the crud out of the tank & fuel lines, so you'll need to be changing your fuel filter every 2 - 4 weeks anyway until this clears. Many vehicles have no problem with seals leaking, and if they do go, the fuel isn't under any pressure, you'll just get a drip.
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