On Sun, 09 Apr 2006 23:26:48 +0000, Roger Long wrote:

I looked into this because I though it would be nice to be have the
smell of peanuts or French fries in a following wind instead of city
bus. I was told, I'm not sure how authoritatively, that the biodiesel
will cause problems for rubber parts. I tried to find out how many of
those there are in my fuel system but couldn't.

It may cause problems with rubber parts, but usually these are between the
fuel tank and the engine, not in/on the engine itself.

Later, when we were getting the engine degunked after sitting for six
years with fuel in it and in the tank (things brokers don't tell you),
we found that the fuel pump diaphragm had dissolved into mush. It looks
like rubber. If regular diesel would do that to it over time, I suspect
that it's something you would want to investigate carefully before using
biodiesel.

Yup.

Also, biodiesel is generally not as stable as petrodiesel, which could be
a concern if you leave fuel in your tanks for months. Check with your
supplier about this. There's a wide range among available fuels. Some
meets mil-spec stability requirements, other stuff is a big
question mark. If you go through fuel pretty quickly and don't leave it
sitting in your tanks for months, this shouldn't be a problem.

Other than that, biodiesel is a lot cleaner, smells better, cleans your
engine, and has better lubricity. You can get lubricity benefits with as
little as 2% mix (B2).

Matt O.